No, but the local languages where repressed and even forbidden for a long time by the republic ("It’s forbidden to spit and spoke X language" policy at schools) in ordrer to increase or create the national unity.

I’m very sad that from the two languages known by my grand parents generation (alsatian and a dialect of dutch) I only know a few words because these languages were destroyed by the state.

No doubt all empires deploy similar tactics, but in respect to the topic at hand I doubt Canada believes there is a credible threat of France using french as an excuse to annex parts of Canada. While Kazakhstan have seen Russia execute this strategy multiple times in very recent years.

They don't fear annexation but they fear independance.