Calendar : Updated French Translations

(Patch Set 3)

- Better visibility.
- General optimization.
- Fixed misspelling French.

- Replacement "..." with "\u2026".
- Replacement "&gt;" with "\u003E".

- Added several missing translations.
- Added "\u00A0" before exclamation mark and question mark, then before and after colon.
- Separation between the new translations, and translations (msgid), to provide better visibility. (translations more friendly)

- Adapatation compared to the original file.
- Header updated and standardized.
- Other small fixes.

Signed-off-by: Thibault LEMOINE <thibaultblizz@gmail.com>