ThemeChooser : Updated French Translations

(Patch Set 2)

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

- Replacement "..." with "\u2026".

- Added several missing translations. (values-fr)

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

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