CONTRIBUTING.md: update trac's url
installer: update Armenian translation
batch files: always switch to the batch file dir first, add license headers in the translation helper scripts
vsfilter_setup.iss: bump minimum Inno Setup to v5.5.3
Compilation.txt: update msysgit version
update ffmpeg (n0.8-18583-g911e270)
update docs/Release.txt
updated Russian translation
Added an empty Romanian translation for future work.
Add Romanian translation.

This commit is based on Daniel Alămiță work.
Inno Setup: Add Romanian translation for non-custom messages.
Give some more room to the translations when possible.