Move translator notes just before translatable strings

Translator notes must be placed just before strings.
Otherwise translator notes are ignored when generating POT files.
We need to be careful when we use multiline *gettext* methods.
How to detect them is a future topic in I18N team.

Change-Id: I808271c76b1669b15ecc20b291493a4f751d546e
Closes-Bug: #1375607
Merge "Move translator notes just before translatable strings"