Current docker upgrade fails

[tgxworld (Alan Tan)]

@carlokok Turns out it was blowing up due to discourse-feature-voting because it had a translation file with an incorrect locale key in it.

FIX: Incorrect locale key.

I also made sure we don’t blow up if the locale key cannot be found.

FIX: Ensure that translations bundle exists before merging plugin bundle.

FIX: Ensure that the right locale exists before merging.

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