Month would appear in the same language as your application.
Do you have the Lightroom application installed in English language or French?
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A number of people have reported this problem with months in non-English configurations: Lightroom: Months in non-English configurations show in English | Photoshop Family Customer Community. Please add your vote and opinion to that topic in the official Adobe feedback forum, which will make it a little more likely Adobe might fix the bug in the next release.
I have installed LR in German, but month does only appear in English even if German or any other language is select in main preference menu.