Changed share l10n string to use a generic template for each share menu items

[sergio-rojasa]

Fix #8604

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed. (Ask a Brave employee to help if you cannot access this document.)

Test Plan:

1. Build from the source: npm run watch
2. Run Brave: npm run start
3. In the URL bar type: https://www.brave.com/
4. On the menu bar click on File.
5. Under File look for Share.
6. Under Share click on one item with share page.

Reviewer Checklist:

• Request a security/privacy review as needed if one was not already requested.

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header