I've set two languages en and fr for French.
I've set multilanguage and translate all including French decimal points and French as default...
On main menu I have 'en' 'en' as languages (second one have 'French' tooltip)... Numbering and dates always in English format.
Looks like you have the wrong id on your French xml file.
Check line 2, it should be like this:
<ew-language date="2016/26/01" version="14.0.0" id="fr" name="French" desc="French" author="jja">
Check here too,
viewtopic.php?f=18&t=40829&p=124166&hilit=french&sid=9f4fc54b6ad3bed6fb5cd637aa5c88cc#p124166