Add a retry button for the subtitle downloads

Fixes #2147 (closed)

changed milestone to %3.5.x

added UI UX bug labels

requested review from @Skantes

added 8 commits

• 1045e660...774010f0 - 7 commits from branch videolan:master
• 3f996f18 - Add a retry button for the subtitle downloads

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approved this merge request

merged