fr-FR updates

Hello,

Here are a first round of reviews and update of the french translations. It is not completely finished.

There is two things worth mentioning :
* In french, there should be an non-breaking space before some punctuation marks (namely colon, semi-colon, and both exclamation and question marks). This is the unicode character with codepoint U+00A0. I have added it in the file but I am not sure how minecraft handles it. If they caused an issue, they could be removed by reverting 120b8fe273c099743d316f912349504e7eca8303 or replace by \u00a0.
* The way the wand names are constructed does not allow to properly translate them in french (and probably in other language); this is a common translation issue. "Iron capped obsidian wand" would translate to "baguette d'obsidienne à embouts de fer". Basically "CAP MATERIAL wand" becomes "wand MATERIAL CAP". If I recall correctly, java.text.MessageFormat allows to use placeholders like {0}, {1}, ... that translaters can reorder in translated strings (see http://docs.oracle.com/javase/6/docs/api/java/text/MessageFormat.html).

Best regards,
Adirelle.