Functional l10n_client / server interaction:

- Get / verify API Key from l10n server
 - Submit translations
 - Fetch translations / updates

Reference: Tasks: 75, 76, 55

TODO: Move out of core (and a series of other tasks).

core/views/admin_languages.html.php

@@ -1,6 +1,11 @@
 <?php defined("SYSPATH") or die("No direct script access.") ?>
 <div id="gLanguages">
-  <h1> <?= t("Language Settings") ?> </h1>
+  <h2> <?= t("Languages") ?> </h2>
 
-  <?= $form ?>
+  <?= $settings_form ?>
+
+  <?= $update_translations_form ?>
+
+  <h2> <?= t("Your Own Translations") ?> </h2>
+  <?= $share_translations_form ?>
 </div>