Enhance FR translation

Change a few strings to clean up the view and make it look like it should (french usually needs more characters than english to express the same idea, it was not good on the Settings tab)
fix double space

small fix
New look for "notes" in SettingsUI

- use <em> to reduce a little bit the font and darken the strings
- <aside> now only works as a regular 'aside' instead of making the text
  italic
- color used (just a darker text-color) #838587
Fix #991
Merge pull request #1046 from MrVaykadji/SettingsUI

New look for "notes" in SettingsUI
Same correction as e09bd2d but for favorite view

and correct indentation for show_list.js
SettingsUI: Align sidebar with content
Merge pull request #1041 from MrVaykadji/patch-1

Enhance FR translation