Enhancement: allow renaming flag from CardBrowser menu

[criticalAY]

Purpose / Description

• 16205, Anki allows flag to be renamed from card browser so replicating that this PR provides a menu option through which we can rename the flag and after sync the same is reflected in Anki desktop

Fixes

• Fixes #16205

How Has This Been Tested?

AnkiDroid: (orange flag)

Anki after sync:

Checklist

Please, go through these checks before submitting the PR.

• [x] You have a descriptive commit message with a short title (first line, max 50 chars).
• [x] You have commented your code, particularly in hard-to-understand areas
• [x] You have performed a self-review of your own code
• [x] UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• [ ] UI Changes: You have tested your change using the Google Accessibility Scanner

[github-actions[bot]]

Message to maintainers, this PR contains strings changes.

1. Before merging this PR, it is best to run the "Sync Translations" GitHub action, then make and merge a PR from the i18n_sync branch to get translations cleaned out.
2. Then merge this PR, and immediately do another translation PR so the huge change made by this PR's key changes are all by themselves.

Read more about updating strings on the wiki,

• localization-administration
• download-localized-strings

[criticalAY]

I have placed the rename option in menu for now, reason too many steps would be required in that case Menu -> Options dialog -> Rename flag -> One more dialog consisting of the list of flag -> flag clicked -> another rename dialog

We can place the rename option just above the Options maybe?

[criticalAY]

[criticalAY]