* Change audio generation files accordingly
New way of working :
units files are ALWAYS named in english based on the names in audio_arm.cpp names.
multiple form (singular, plural(s) are ammended with 0 to 4 suffix, according to languages rules. example : meter1.wav for first form of plural of meter unit,. This filename needs to be the same for all languages (in their respective directories of course)
* Care for gruin9x
* Better form
* Other languages
* Cosmetics
Break up tts.py so that each language configuration of system and custom
sounds is done in a separate file, also fixing PEP8 problems with
tts.py, mostly whitespace related
