fixes #2345 create piwigo standard pages

create new theme standard pages with tpl, css, js and images
update backend to handle pages
add config use_standard_pages
on update set config to false, on install set config to true
add standard pages to no be ingored in git

admin/configuration.php

@@ -50,6 +50,7 @@ $main_checkboxes = array(
     'show_mobile_app_banner_in_gallery',
     'show_mobile_app_banner_in_admin',
     'upload_detect_duplicate',
+    'use_standard_pages',
    );
 
 $sizes_checkboxes = array(

admin/themes/default/template/configuration_main.tpl

@@ -252,6 +252,17 @@ jQuery("input[name='email_admin_on_new_user_filter']").change(function() {
         <span class="icon-help-circled tiptip" title="{'During upload, if Piwigo detects the photo already exists, associate the existing photo to the destination album, without duplicating file'|translate}" style="cursor:help"></span>
       </li>
 
+      <li>
+        <label class="font-checkbox">
+          <span class="icon-check"></span>
+          <input type="checkbox" name="use_standard_pages" {if ($main.use_standard_pages)}checked="checked"{/if}>
+            {'Use standard Piwigo template for common pages.'|translate}
+        </label>
+
+        <span class="icon-help-circled tiptip" title="{'When enabled, a common template is used for the login, registration and forgotten password pages, regardless of the theme. Some themes might use these templates even if you uncheck this option'|translate}" style="cursor:help"></span>
+      </li>
+
+
 
       <li>
         <label>{'Mail theme'|translate}</label>

admin/themes_installed.php

@@ -59,7 +59,7 @@ $tpl_themes = array();
 
 foreach ($themes->fs_themes as $theme_id => $fs_theme)
 {
-  if ($theme_id == 'default')
+  if ($theme_id == 'default' or $theme_id == 'standard_pages')
   {
     continue;
   }