fix(manager): remove obsolete Contact Us translation keys

[ohnorobo]

Follow up to #2754 removing unused strings

Strips nav-contact-us and the contact-view-* keys from all locale files. Follow-up to removing the Contact Us dialog flow in the manager.

[greptile-apps]

Greptile Summary

This PR removes 11 obsolete i18n translation keys (nav-contact-us and contact-view-*) from all 66 locale files under server_manager/messages/, as a follow-up to PR #2754 which removed the Contact Us dialog flow from the manager UI.

• Removes 11 keys (nav-contact-us, contact-view-intro, contact-view-issue, contact-view-issue-*, contact-view-exit-*, contact-view-open-ticket) from all 66 language locale files
• Also removes these keys from master_messages.json (the source-of-truth descriptor file)
• Fixes a missing trailing newline in several locale files (e.g. af.json, am.json) as a side effect
• Verified: no remaining references to the removed keys exist anywhere in server_manager/ (HTML, TS, JS, or JSON), confirming the removal is safe
• Note: client/web/messages/ locale files also contain contact-view-* keys but those are for the separate client app and are not affected by this PR

Confidence Score: 5/5

Safe to merge — purely removes dead translation keys with no remaining code references.

The change is mechanical and low-risk: it deletes keys that are no longer referenced by any server_manager code (verified via search), from all locale files consistently, including the master_messages.json source file. No logic changes, no API surface changes, no remaining references to the deleted keys.

No files require special attention.

Important Files Changed

Filename	Overview
server_manager/messages/master_messages.json	Source-of-truth descriptor file: all contact-view-* and nav-contact-us entries correctly removed.
server_manager/messages/en.json	English base locale: 11 obsolete keys cleanly removed with no remaining references.
server_manager/messages/af.json	Afrikaans locale: keys removed; trailing newline also fixed as a side effect.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[PR #2754: Remove Contact Us dialog flow\nfrom Manager UI source code] --> B[Orphaned i18n keys remain\nin all 66 locale JSON files]
    B --> C[This PR #2755: Remove obsolete keys]
    C --> D[master_messages.json\nnav-contact-us removed\ncontact-view-* removed]
    C --> E[66 locale files\nnav-contact-us removed\ncontact-view-* removed]
    D & E --> F[No dangling key references\nin server_manager/]
    G[client/web/messages/\ncontact-view-* keys] --> H[Untouched — separate client app\nhas its own i18n scope]

Loading

_{Reviews (1): Last reviewed commit: "remove obsolete Contact Us translation k..." | Re-trigger Greptile}

[ohnorobo]

@fortuna I still need your approval here as a follow up to #2754