Revert "Add French translation"

This reverts commit 297b2eeb74c1d19a2a5b4a3b21c46f337eb3f2f8.
Revert "French translation for btsync"

This reverts commit 63a6f538d2a7df56ab10e0e947b49c37ac32190e.
Revert "Add French translation"

This reverts commit dcaec030969fe6e0533a36b613a0d317b6f72b79.