Add check for install_disabled file in language directories to avoid listing them during the installation if incomplete

Add text to invite people to contribute new translations if they cannot find theirs in the installer list - refs #7325

main/install/install.lib.php

@@ -381,6 +381,11 @@ function & get_language_folder_list() {
                 continue;
             }
             if (is_dir($dirname.$entries)) {
+                if (is_file($dirname.$entries.'/install_disabled')) {
+                    // Skip all languages that have this file present, just for
+                    // the install process (languages incomplete)
+                    continue;
+                }
                 $result[$entries] = ucwords(str_replace($search, $replace_with, $entries));
             }
         }
@@ -1029,7 +1034,7 @@ function display_language_selection_box($name = 'language_list', $default_langua
  * can be done in the language of the user
  */
 function display_language_selection() { ?>
-    <h2><?php get_lang('WelcomeToTheDokeosInstaller'); ?></h2>
+    <h2><?php get_lang('WelcomeToTheChamiloInstaller'); ?></h2>
     <div class="RequirementHeading">
         <h2><?php echo display_step_sequence(); ?><?php echo get_lang('InstallationLanguage'); ?></h2>
         <p><?php echo get_lang('PleaseSelectInstallationProcessLanguage'); ?>:</p>
@@ -1038,6 +1043,10 @@ function display_language_selection() { ?>
         <button type="submit" name="step1" class="btn next" value="<?php echo get_lang('Next'); ?>"><?php echo get_lang('Next'); ?></button>
         <input type="hidden" name="is_executable" id="is_executable" value="-" />
         </form>
+        <br /><br />
+    </div>
+    <div class="RequirementHeading">
+        <?php echo get_lang('YourLanguageNotThereContactUs'); ?>
     </div>
 <?php
 }