Use consistent product name for 'Firefox Translations' in Fluent (Fixes #15442)

[stephaniehobson]

One-line summary

Treat "Firefox Translations" as a single product name in Fluent strings.

Significant changes and points to review

• This is the contents of Use consistent product name for 'Firefox Translations' in Fluent (Fixes #15442) #15459 with the addition of some versioning
• Updated instances of { -brand-name-firefox } Translations to { -brand-name-firefox-translations } in relevant files.
• Ensured consistency by using the pre-defined { -brand-name-firefox-translations } entry from brands.ftl across all strings.
• Verified that the changes align with the Fluent localization standards for product naming.

Issue / Bugzilla link

Resolves Issue #15442

Testing

• Manually checked that each modified string renders "Firefox Translations" as a single entity in the UI.
• Confirmed the updated strings in different localization scenarios to ensure they display correctly.