Fix: new compare merge request locale issues

What does this MR do and why?

Describe in detail what your merge request does and why.

Reason

The current version of new compare merge request page has some raw texts, this MR is meant to make the strings translated.

/cc @prajnamas @orozot @qk44077907

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2. Go to any project > Merge Request > Create new Merge Request
3. Observe.

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