fix(agent-installer): backfill Agent Tunnel localization strings to JSON

[irvingouj@Devolutions (irvingoujAtDevolution)]

Summary

The 11 Agent Tunnel localization strings added in #1789 were hand-edited directly into the generated .wxl files without corresponding entries in the JSON sources (Strings_en-US.json / Strings_fr-FR.json). The next Strings.g.tt regeneration would silently delete them — exactly the failure mode Richard flagged.

This backfills all 11 keys to both JSON sources and regenerates.

Review note

• Real change: JSON sources (+11 each) and the 11 new Strings.g.cs constants.
• The .wxl diffs are pure reordering — the generator sorts by Id within each group. Id set vs master is +0/-0 (no keys added/removed, no text changed); those keys already existed in the .wxl.
• Regenerated via VS "Run Custom Tool" on Strings.g.tt.

No user-visible change.

Changelog: ignore

[github-actions]

Let maintainers know that an action is required on their side

• Add the label release-required Please cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module) when you request a maintainer to cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module)

• Add the label release-blocker Follow-up is required before cutting a new release if a follow-up is required before cutting a new release

• Add the label publish-required Please publish libraries (`Devolutions.Gateway.Utils`, OpenAPI clients, etc) when you request a maintainer to publish libraries (Devolutions.Gateway.Utils, OpenAPI clients, etc.)

• Add the label publish-blocker Follow-up is required before publishing libraries if a follow-up is required before publishing libraries

[Benoît Cortier (CBenoit)]

Thank you!