diff --git a/phpBB/adm/style/acp_ext_disable.html b/phpBB/adm/style/acp_ext_disable.html
index 7dc3f6ec97..4fa0893be7 100644
--- a/phpBB/adm/style/acp_ext_disable.html
+++ b/phpBB/adm/style/acp_ext_disable.html
@@ -5,29 +5,29 @@
 	<h1>{L_EXTENSIONS_ADMIN}</h1>
 
 	<p>{L_EXTENSIONS_EXPLAIN}</p>
-	<p>{L_DISABLE_EXPLAIN}</p>
+	<p>{L_EXTENSION_DISABLE_EXPLAIN}</p>
 
 	<!-- IF PRE -->
 	<div class="errorbox">
-		<p>{L_DISABLE_CONFIRM}</p>
+		<p>{L_CONFIRM_MESSAGE}</p>
 	</div>
 
 	<form id="acp_extensions" method="post" action="{U_DISABLE}">
 	<fieldset class="submit-buttons">
-		<legend>{L_DISABLE}</legend>
-		<input class="button1" type="submit" name="disable" value="{L_DISABLE}" />
+		<legend>{L_EXTENSION_DISABLE}</legend>
+		<input class="button1" type="submit" name="disable" value="{L_EXTENSION_DISABLE}" />
 		<input class="button2" type="submit" name="cancel" value="{L_CANCEL}" />
 	</fieldset>
 	</form>
 	<!-- ELSEIF S_NEXT_STEP -->
 		<div class="errorbox">
-			<p>{L_DISABLE_IN_PROGRESS}</p>
+			<p>{L_EXTENSION_DISABLE_IN_PROGRESS}</p>
 		</div>
 	<!-- ELSE -->
 		<div class="successbox">
-			<p>{L_DISABLE_SUCCESS}</p>
+			<p>{L_EXTENSION_DISABLE_SUCCESS}</p>
 			<br />
-			<p><a href="{U_RETURN}">{L_RETURN}</a></p>
+			<p><a href="{U_RETURN}">{L_RETURN_TO_EXTENSION_LIST}</a></p>
 		</div>
 	<!-- ENDIF -->
 
diff --git a/phpBB/adm/style/acp_ext_enable.html b/phpBB/adm/style/acp_ext_enable.html
index 35585207eb..2a8c638b1d 100644
--- a/phpBB/adm/style/acp_ext_enable.html
+++ b/phpBB/adm/style/acp_ext_enable.html
@@ -5,35 +5,35 @@
 	<h1>{L_EXTENSIONS_ADMIN}</h1>
 
 	<p>{L_EXTENSIONS_EXPLAIN}</p>
-	<p>{L_ENABLE_EXPLAIN}</p>
+	<p><!-- IF IS_ENABLING -->{L_EXTENSION_ENABLE_EXPLAIN}<!-- ELSE -->{L_EXTENSION_INSTALL_EXPLAIN}<!-- ENDIF --></p>
 
 	<!-- IF MIGRATOR_ERROR -->
 	<div class="errorbox">
 		<p><strong>{L_MIGRATION_EXCEPTION_ERROR}</strong></p>
 		<p>{MIGRATOR_ERROR}</p>
-		<p><a href="{U_RETURN}">{L_RETURN}</a></p>
+		<p><a href="{U_RETURN}">{L_RETURN_TO_EXTENSION_LIST}</a></p>
 	</div>
 	<!-- ELSEIF PRE -->
 	<div class="errorbox">
-		<p>{L_ENABLE_CONFIRM}</p>
+		<p>{L_CONFIRM_MESSAGE}</p>
 	</div>
 
 	<form id="acp_extensions" method="post" action="{U_ENABLE}">
 	<fieldset class="submit-buttons">
-		<legend>{L_ENABLE}</legend>
-		<input class="button1" type="submit" name="enable" value="{L_ENABLE}" />
+		<legend><!-- IF IS_ENABLING -->{L_EXTENSION_ENABLE}<!-- ELSE -->{L_EXTENSION_INSTALL}<!-- ENDIF --></legend>
+		<input class="button1" type="submit" name="enable" value="<!-- IF IS_ENABLING -->{L_EXTENSION_ENABLE}<!-- ELSE -->{L_EXTENSION_INSTALL}<!-- ENDIF -->" />
 		<input class="button2" type="submit" name="cancel" value="{L_CANCEL}" />
 	</fieldset>
 	</form>
 	<!-- ELSEIF S_NEXT_STEP -->
 		<div class="errorbox">
-			<p>{L_ENABLE_IN_PROGRESS}</p>
+			<p><!-- IF IS_ENABLING -->{L_EXTENSION_ENABLE_IN_PROGRESS}<!-- ELSE -->{L_EXTENSION_INSTALL_IN_PROGRESS}<!-- ENDIF --></p>
 		</div>
 	<!-- ELSE -->
 		<div class="successbox">
-			<p>{L_ENABLE_SUCCESS}</p>
+			<p><!-- IF IS_ENABLING -->{L_EXTENSION_ENABLE_SUCCESS}<!-- ELSE -->{L_EXTENSION_INSTALL_SUCCESS}<!-- ENDIF --></p>
 			<br />
-			<p><a href="{U_RETURN}">{L_RETURN}</a></p>
+			<p><a href="{U_RETURN}">{L_RETURN_TO_EXTENSION_LIST}</a></p>
 		</div>
 	<!-- ENDIF -->
 
diff --git a/phpBB/adm/style/acp_ext_list.html b/phpBB/adm/style/acp_ext_list.html
index 390b3e79f0..8408ebe748 100644
--- a/phpBB/adm/style/acp_ext_list.html
+++ b/phpBB/adm/style/acp_ext_list.html
@@ -18,9 +18,7 @@
 	<tbody>
 		<!-- IF .enabled -->
 		<tr>
-			<td class="row3" colspan="3">
-				<strong>{L_ENABLED} {L_EXTENSIONS}</strong>
-			</td>
+			<td class="row3" colspan="3"><strong>{L_EXTENSIONS_ENABLED}</strong></td>
 		</tr>
 		<!-- BEGIN enabled -->
 		<tr class="ext_enabled">
@@ -28,7 +26,7 @@
 			<td style="text-align: center;"><a href="{enabled.U_DETAILS}">{L_DETAILS}</a></td>
 			<td style="text-align: center;">
 				<!-- BEGIN actions -->
-					<a href="{enabled.actions.U_ACTION}" title="{enabled.actions.L_ACTION}">{enabled.actions.L_ACTION}</a>
+					<a href="{enabled.actions.U_ACTION}"<!-- IF enabled.actions.L_ACTION_EXPLAIN --> title="{enabled.actions.L_ACTION_EXPLAIN}"<!-- ENDIF -->>{enabled.actions.L_ACTION}</a>
 					<!-- IF not enabled.actions.S_LAST_ROW -->&nbsp;|&nbsp;<!-- ENDIF -->
 				<!-- END actions -->
 			</td>
@@ -38,7 +36,7 @@
 
 		<!-- IF .disabled -->
 		<tr>
-			<td class="row3" colspan="3"><strong>{L_DISABLED} {L_EXTENSIONS}</strong></td>
+			<td class="row3" colspan="3"><strong>{L_EXTENSIONS_DISABLED}</strong></td>
 		</tr>
 		<!-- BEGIN disabled -->
 		<tr class="ext_disabled">
@@ -48,7 +46,7 @@
 			</td>
 			<td style="text-align: center;">
 				<!-- BEGIN actions -->
-					<a href="{disabled.actions.U_ACTION}" title="{disabled.actions.L_ACTION}">{disabled.actions.L_ACTION}</a>
+					<a href="{disabled.actions.U_ACTION}"<!-- IF disabled.actions.L_ACTION_EXPLAIN --> title="{disabled.actions.L_ACTION_EXPLAIN}"<!-- ENDIF -->>{disabled.actions.L_ACTION}</a>
 					<!-- IF not disabled.actions.S_LAST_ROW -->&nbsp;|&nbsp;<!-- ENDIF -->
 				<!-- END actions -->
 			</td>
diff --git a/phpBB/adm/style/acp_ext_purge.html b/phpBB/adm/style/acp_ext_purge.html
index 94bef82ca5..310efd0e1d 100644
--- a/phpBB/adm/style/acp_ext_purge.html
+++ b/phpBB/adm/style/acp_ext_purge.html
@@ -5,35 +5,35 @@
 	<h1>{L_EXTENSIONS_ADMIN}</h1>
 
 	<p>{L_EXTENSIONS_EXPLAIN}</p>
-	<p>{L_PURGE_EXPLAIN}</p>
+	<p>{L_EXTENSION_UNINSTALL_EXPLAIN}</p>
 
 	<!-- IF MIGRATOR_ERROR -->
 	<div class="errorbox">
 		<p><strong>{L_MIGRATION_EXCEPTION_ERROR}</strong></p>
 		<p>{MIGRATOR_ERROR}</p>
-		<p><a href="{U_RETURN}">{L_RETURN}</a></p>
+		<p><a href="{U_RETURN}">{L_RETURN_TO_EXTENSION_LIST}</a></p>
 	</div>
 	<!-- ELSEIF PRE -->
 	<div class="errorbox">
-		<p>{L_PURGE_CONFIRM}</p>
+		<p>{L_CONFIRM_MESSAGE}</p>
 	</div>
 
 	<form id="acp_extensions" method="post" action="{U_PURGE}">
 	<fieldset class="submit-buttons">
-		<legend>{L_PURGE}</legend>
-		<input class="button1" type="submit" name="purge" value="{L_PURGE}" />
+		<legend>{L_EXTENSION_UNINSTALL}</legend>
+		<input class="button1" type="submit" name="purge" value="{L_EXTENSION_UNINSTALL}" />
 		<input class="button2" type="submit" name="cancel" value="{L_CANCEL}" />
 	</fieldset>
 	</form>
 	<!-- ELSEIF S_NEXT_STEP -->
 		<div class="errorbox">
-			<p>{L_PURGE_IN_PROGRESS}</p>
+			<p>{L_EXTENSION_UNINSTALL_IN_PROGRESS}</p>
 		</div>
 	<!-- ELSE -->
 		<div class="successbox">
-			<p>{L_PURGE_SUCCESS}</p>
+			<p>{L_EXTENSION_UNINSTALL_SUCCESS}</p>
 			<br />
-			<p><a href="{U_RETURN}">{L_RETURN}</a></p>
+			<p><a href="{U_RETURN}">{L_RETURN_TO_EXTENSION_LIST}</a></p>
 		</div>
 	<!-- ENDIF -->
 
diff --git a/phpBB/includes/acp/acp_extensions.php b/phpBB/includes/acp/acp_extensions.php
index b41f4d4e81..896c911859 100644
--- a/phpBB/includes/acp/acp_extensions.php
+++ b/phpBB/includes/acp/acp_extensions.php
@@ -83,6 +83,7 @@ class acp_extensions
 			break;
 
 			case 'enable_pre':
+			case 'install_pre':
 				if (!$md_manager->validate_enable())
 				{
 					trigger_error($user->lang['EXTENSION_NOT_AVAILABLE'] . adm_back_link($this->u_action), E_USER_WARNING);
@@ -96,12 +97,15 @@ class acp_extensions
 				$this->tpl_name = 'acp_ext_enable';
 
 				$template->assign_vars(array(
-					'PRE'		=> true,
-					'U_ENABLE'	=> $this->u_action . '&amp;action=enable&amp;ext_name=' . urlencode($ext_name),
+					'PRE'				=> true,
+					'IS_ENABLING'		=> $action == 'enable_pre',
+					'L_CONFIRM_MESSAGE'	=> $this->user->lang('EXTENSION_' . (($action == 'enable_pre') ? 'ENABLE' : 'INSTALL') . '_CONFIRM', $ext_name),
+					'U_ENABLE'			=> $this->u_action . '&amp;action=' . (($action == 'enable_pre') ? 'enable' : 'install') . '&amp;ext_name=' . urlencode($ext_name),
 				));
 			break;
 
 			case 'enable':
+			case 'install':
 				if (!$md_manager->validate_enable())
 				{
 					trigger_error($user->lang['EXTENSION_NOT_AVAILABLE'] . adm_back_link($this->u_action), E_USER_WARNING);
@@ -116,7 +120,7 @@ class acp_extensions
 						{
 							$template->assign_var('S_NEXT_STEP', true);
 
-							meta_refresh(0, $this->u_action . '&amp;action=enable&amp;ext_name=' . urlencode($ext_name));
+							meta_refresh(0, $this->u_action . '&amp;action=' . $action . '&amp;ext_name=' . urlencode($ext_name));
 						}
 					}
 				}
@@ -128,7 +132,8 @@ class acp_extensions
 				$this->tpl_name = 'acp_ext_enable';
 
 				$template->assign_vars(array(
-					'U_RETURN'	=> $this->u_action . '&amp;action=list',
+					'IS_ENABLING'	=> $action == 'enable',
+					'U_RETURN'		=> $this->u_action . '&amp;action=list',
 				));
 			break;
 
@@ -141,8 +146,9 @@ class acp_extensions
 				$this->tpl_name = 'acp_ext_disable';
 
 				$template->assign_vars(array(
-					'PRE'		=> true,
-					'U_DISABLE'	=> $this->u_action . '&amp;action=disable&amp;ext_name=' . urlencode($ext_name),
+					'PRE'				=> true,
+					'L_CONFIRM_MESSAGE'	=> $this->user->lang('EXTENSION_DISABLE_CONFIRM', $ext_name),
+					'U_DISABLE'			=> $this->u_action . '&amp;action=disable&amp;ext_name=' . urlencode($ext_name),
 				));
 			break;
 
@@ -169,8 +175,9 @@ class acp_extensions
 				$this->tpl_name = 'acp_ext_purge';
 
 				$template->assign_vars(array(
-					'PRE'		=> true,
-					'U_PURGE'	=> $this->u_action . '&amp;action=purge&amp;ext_name=' . urlencode($ext_name),
+					'PRE'				=> true,
+					'L_CONFIRM_MESSAGE'	=> $this->user->lang('EXTENSION_UNINSTALL_CONFIRM', $ext_name),
+					'U_PURGE'			=> $this->u_action . '&amp;action=purge&amp;ext_name=' . urlencode($ext_name),
 				));
 			break;
 
@@ -233,7 +240,7 @@ class acp_extensions
 
 				$this->output_actions('enabled', array(
 					'DISABLE'		=> $this->u_action . '&amp;action=disable_pre&amp;ext_name=' . urlencode($name),
-					'PURGE'			=> $this->u_action . '&amp;action=purge_pre&amp;ext_name=' . urlencode($name),
+					'UNINSTALL'		=> $this->u_action . '&amp;action=purge_pre&amp;ext_name=' . urlencode($name),
 				));
 			}
 			catch(\phpbb\extension\exception $e)
@@ -267,7 +274,7 @@ class acp_extensions
 
 				$this->output_actions('disabled', array(
 					'ENABLE'		=> $this->u_action . '&amp;action=enable_pre&amp;ext_name=' . urlencode($name),
-					'PURGE'			=> $this->u_action . '&amp;action=purge_pre&amp;ext_name=' . urlencode($name),
+					'UNINSTALL'		=> $this->u_action . '&amp;action=purge_pre&amp;ext_name=' . urlencode($name),
 				));
 			}
 			catch(\phpbb\extension\exception $e)
@@ -302,7 +309,7 @@ class acp_extensions
 				));
 
 				$this->output_actions('disabled', array(
-					'ENABLE'		=> $this->u_action . '&amp;action=enable_pre&amp;ext_name=' . urlencode($name),
+					'INSTALL'		=> $this->u_action . '&amp;action=install_pre&amp;ext_name=' . urlencode($name),
 				));
 			}
 			catch(\phpbb\extension\exception $e)
@@ -325,8 +332,9 @@ class acp_extensions
 		foreach ($actions as $lang => $url)
 		{
 			$this->template->assign_block_vars($block . '.actions', array(
-				'L_ACTION'		=> $this->user->lang($lang),
-				'U_ACTION'		=> $url,
+				'L_ACTION'			=> $this->user->lang('EXTENSION_' . $lang),
+				'L_ACTION_EXPLAIN'	=> (isset($this->user->lang['EXTENSION_' . $lang . '_EXPLAIN'])) ? $this->user->lang('EXTENSION_' . $lang . '_EXPLAIN') : '',
+				'U_ACTION'			=> $url,
 			));
 		}
 	}
diff --git a/phpBB/language/en/acp/extensions.php b/phpBB/language/en/acp/extensions.php
index 369397ead2..d97100da70 100644
--- a/phpBB/language/en/acp/extensions.php
+++ b/phpBB/language/en/acp/extensions.php
@@ -39,47 +39,44 @@ $lang = array_merge($lang, array(
 	'EXTENSIONS'				=> 'Extensions',
 	'EXTENSIONS_ADMIN'			=> 'Extensions Manager',
 	'EXTENSIONS_EXPLAIN'		=> 'The Extensions Manager is a tool in your phpBB Board which allows you to manage all of your extensions statuses and view information about them.',
-	'EXTENSION_INVALID_LIST'	=> 'The "%s" extension is not valid.<br />%s<br /><br />',
+	'EXTENSION_INVALID_LIST'	=> 'The “%s” extension is not valid.<br />%s<br /><br />',
 	'EXTENSION_NOT_AVAILABLE'	=> 'The selected extension is not available for this board, please verify your phpBB and PHP versions are allowed (see the details page).',
 
 	'DETAILS'				=> 'Details',
 
-	'AVAILABLE'				=> 'Available',
-	'ENABLED'				=> 'Enabled',
-	'DISABLED'				=> 'Disabled',
-	'PURGED'				=> 'Purged',
-	'UPLOADED'				=> 'Uploaded',
+	'EXTENSIONS_ENABLED'	=> 'Enabled Extensions',
+	'EXTENSIONS_DISABLED'	=> 'Disabled Extensions',
 
-	'ENABLE'				=> 'Enable',
-	'DISABLE'				=> 'Disable',
-	'PURGE'					=> 'Purge',
+	'EXTENSION_DISABLE'		=> 'Disable',
+	'EXTENSION_ENABLE'		=> 'Enable',
+	'EXTENSION_INSTALL'		=> 'Install',
+	'EXTENSION_UNINSTALL'	=> 'Uninstall',
 
-	'ENABLE_EXPLAIN'		=> 'Enabling an extension allows you to use it on your board.',
-	'DISABLE_EXPLAIN'		=> 'Disabling an extension retains its files and settings but removes any functionality added by the extension.',
-	'PURGE_EXPLAIN'			=> 'Purging an extension clears an extensions data while retaining its files.',
-	'DELETE_EXPLAIN'		=> 'Deleting an extension removes all of its files and settings. Log entries will remain, although any language variables added by the extension will not be available.',
+	'EXTENSION_DISABLE_EXPLAIN'		=> 'Disabling an extension retains its files, data and settings but removes any functionality added by the extension.',
+	'EXTENSION_ENABLE_EXPLAIN'		=> 'Enabling an extension allows you to use it on your board.',
+	'EXTENSION_INSTALL_EXPLAIN'		=> 'Installing an extension will perform database changes that are required to use the extension on your board.',
+	'EXTENSION_UNINSTALL_EXPLAIN'	=> 'Uninstalling an extension removes all data and settings of the extensions. Only the extension files are retained, so you can install it again.',
 
-	'DISABLE_IN_PROGRESS'	=> 'The extension is currently being disabled, please do not leave this page or refresh until it is completed.',
-	'ENABLE_IN_PROGRESS'	=> 'The extension is currently being installed, please do not leave this page or refresh until it is completed.',
-	'PURGE_IN_PROGRESS'		=> 'The extension is currently being purged, please do not leave this page or refresh until it is completed.',
-	'ENABLE_SUCCESS'		=> 'The extension was enabled successfully',
-	'DISABLE_SUCCESS'		=> 'The extension was disabled successfully',
-	'PURGE_SUCCESS'			=> 'The extension was purged successfully',
+	'EXTENSION_DISABLE_IN_PROGRESS'	=> 'The extension is currently being disabled, please do not leave this page or refresh until it is completed.',
+	'EXTENSION_ENABLE_IN_PROGRESS'	=> 'The extension is currently being enabled, please do not leave this page or refresh until it is completed.',
+	'EXTENSION_INSTALL_IN_PROGRESS'	=> 'The extension is currently being installed, please do not leave this page or refresh until it is completed.',
+	'EXTENSION_UNINSTALL_IN_PROGRESS'	=> 'The extension is currently being purged, please do not leave this page or refresh until it is completed.',
 
-	'ENABLE_FAIL'			=> 'The extension could not be enabled',
-	'DISABLE_FAIL'			=> 'The extension could not be disabled',
-	'PURGE_FAIL'			=> 'The extension could not be purged',
+	'EXTENSION_DISABLE_SUCCESS'		=> 'The extension was disabled successfully',
+	'EXTENSION_ENABLE_SUCCESS'		=> 'The extension was enabled successfully',
+	'EXTENSION_INSTALL_SUCCESS'		=> 'The extension was installed successfully',
+	'EXTENSION_UNINSTALL_SUCCESS'	=> 'The extension was uninstalled successfully',
 
 	'EXTENSION_NAME'		=> 'Extension Name',
 	'EXTENSION_ACTIONS'		=> 'Actions',
 	'EXTENSION_OPTIONS'		=> 'Options',
 
-	'ENABLE_CONFIRM'		=> 'Are you sure that you wish to enable this extension?',
-	'DISABLE_CONFIRM'		=> 'Are you sure that you wish to disable this extension?',
-	'PURGE_CONFIRM'			=> 'Are you sure that you wish to purge this extension&#39;s data? This will remove all settings stored for this extension and cannot be undone!',
+	'EXTENSION_DISABLE_CONFIRM'		=> 'Are you sure that you wish to disable the “%s” extension?',
+	'EXTENSION_ENABLE_CONFIRM'		=> 'Are you sure that you wish to enable the “%s” extension?',
+	'EXTENSION_INSTALL_CONFIRM'		=> 'Are you sure that you wish to install the “%s” extension?',
+	'EXTENSION_UNINSTALL_CONFIRM'	=> 'Are you sure that you wish to uninstall the “%s” extension? This will remove all data and settings stored for this extension and cannot be undone!',
 
-	'WARNING'				=> 'Warning',
-	'RETURN'				=> 'Return',
+	'RETURN_TO_EXTENSION_LIST'	=> 'Return to the extension list',
 
 	'EXT_DETAILS'			=> 'Extension Details',
 	'DISPLAY_NAME'			=> 'Display Name',