Update LANGUAGES.XML

I'm Infini at the Apoc forum.
I'll start to add the French translation to the project.
Thank you
Update STRINGS.XML

In the en_gb language, there's a mistake I think.
For the character  '  ,  &amp;apos;  is used instead of  &apos;  , OR I'm mistaken.

Thank you
Merge pull request #17 from 5thAvenue/patch-1

Update LANGUAGES.XML
Merge pull request #18 from 5thAvenue/patch-2

Update STRINGS.XML
Merge remote-tracking branch 'pmprog/master'