i18n refactoring: Rename all _() (reserved by gettext) calls to t().

- And refactor printf to our string interpolation / pluralization syntax
- Also, a slight change to the translations_incomings table, using binary(16) instead of char(32) as message key.

modules/user/views/admin_groups.html.php

@@ -1,24 +1,24 @@
 <?php defined("SYSPATH") or die("No direct script access.") ?>
 <div class="gBlock">
-  <h2><?= _("Group Administration") ?></h2>
+  <h2><?= t("Group Administration") ?></h2>
   <div class="gBlockContent">
-    <p><?= _("These are the groups in your system") ?></p>
+    <p><?= t("These are the groups in your system") ?></p>
   </div>
   <ul>
     <? foreach ($groups as $i => $group): ?>
     <li>
       <?= $group->name ?>
       <a href="groups/edit_form/<?= $group->id ?>" class="gDialogLink"
-        title="<?= _("Edit group") ?>"><?= _("edit") ?></a>
+        title="<?= t("Edit group") ?>"><?= t("edit") ?></a>
       <? if (!$group->special): ?>
         <a href="groups/delete_form/<?= $group->id ?>" class="gDialogLink"
-          title="<?= sprintf(_("Do you really want to delete %s"), $group->name) ?>">
-        <?= _("delete") ?></a>
+          title="<?= t("Do you really want to delete {{group_name}}", array("group_name" => $group->name)) ?>">
+        <?= t("delete") ?></a>
       <? endif ?>
     </li>
     <? endforeach ?>
     <li><a href="groups/add_form" class="gDialogLink"
-      title="<?= _("Add group") ?>"><?= _("Add group") ?></a></li>
+      title="<?= t("Add group") ?>"><?= t("Add group") ?></a></li>
   </ul>
 </div>