Annotate graph page for internationalization

What does this MR do?

When a user goes to the graph page, the text should be translated

On the graph page, the following is annotated for translation

• Branch selector
• Description
• Placeholder for input
• Label on checkbox

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

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
• Internationalization required/considered
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

#41330 (closed)