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/comment/views/comments.html.php

@@ -9,8 +9,8 @@
     <? //endif ?>
     <p class="gAuthor">
       <a href="#"><img src="<?= $avatar ?>" class="gAvatar" alt="<?= $comment->author ?>" /></a>
-      <?= _("on ") . date("Y-M-d H:i:s", $comment->created) ?>
-      <a href="#"><?= $comment->author ?></a> <?= _("said") ?>
+      <?= t("on ") . date("Y-M-d H:i:s", $comment->created) ?>
+      <a href="#"><?= $comment->author ?></a> <?= t("said") ?>
     </p>
     <div>
       <?= $comment->text ?>