Change unicode for non-standard spaces

What does this MR do?

I found that 3 files had some scattered non-standard unicode spaces:

• U+00A0 : NO-BREAK SPACE [NBSP]
• U+202F : NARROW NO-BREAK SPACE [NNBSP]

This MR simply cleans these up by replacing them with standard SP spaces, for consistency.

• Ex: "This is[NBSP]an example!" changed to "This is an example!"

In the French gitlab.po file, some of the spaces were deleted instead of replaced, as it was clear that no space was supposed to be there (likely added by someone's editor by accident).

• Ex: "This is an example[NNBSP]!" changed to "This is an example!"

What are the relevant issue numbers?

• Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/57039
• Related to gitlab#26446 (closed)

Does this MR meet the acceptance criteria?

• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer