Alternative French translation

Alternative French translation based on current one.

In these translations I mainly tried to standardize texts, respect as most as possible French typography, correct some mistakes and translate missing texts. I also replace some translations of specific words (e.g. virtual console's widgets, functions types).
Here are the main words with their purposed translation:
- in VC Widgets:
    - Slider -> Fader
    - Knob -> Bouton rotatif
    - Speed Dial -> Contrôleur de vitesse
    - XY Pad -> Pad XY
    - Cue list -> Séquenceur
    - Frame -> Fenêtre
    - Solo Frame -> Fenêtre de solos
    - Audio Triggers -> Déclencheurs audio
    - Grand Master -> Grand Master (ou Intensité générale ?)
- in the Simple Desk -> Pupitre traditionnel :
    - Cue -> Mémoire
    - Cue Stack -> Pile de mémoires
    - Cue Stack - Playback %1 -> Pile de mémoires - Fader %1
    - Playback (bottom-left) -> Faders de lancement
- in the IO Patch:
    - Plugin -> Plugin
    - Feedback -> Rétroaction

If you speak French, feel free to have a look and give your feedback, proposal and corrections - especially you NiKoyes! Thanks!

And in doing this it makes me think about some ideas, suggestions or questions about current source text. I've put those into translatorcomment tag and it starts with "Q:" if you have some time to have a look please!