Resolve "Rename "Browse file" inputs to "Choose file""

What does this MR do?

1. Renames Browse file to Choose file
2. Adds i18n
3. Uniforms all avatar upload forms

group	project	user

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Review
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

Closes #40780 (closed)