feat(agent,agent-installer): add Swedish localization

[Richard Markiewicz (thenextman)]

Devolutions Agent now installs in Swedish on systems using a Swedish UI language, and the Desktop Agent tray menu and messages are translated.
Swedish was contributed by Daniel Nylander.

Co-authored-by: Daniel Nylander github@danielnylander.se

[Richard Markiewicz (thenextman)]

Implementation notes (supersedes #1984):

• The sv-SE installer strings are now Strings_sv-SE.json, converted from feat(agent): add Swedish Desktop Agent localization #1984's hand-written .wxl so the translations are unchanged except FeatureSessionDescription, which was updated to match the current English text. DevolutionsAgent_sv-se.wxl is generated by the T4 template, not hand-edited.
• feat(agent): add Swedish Desktop Agent localization #1984's .wxl would have failed the full MSI build: WiX 3's firewall extension only ships strings for a few cultures, so light rejects sv-SE with LGHT0102 unless the dialogs.firewall strings are defined. They are now translated, as already done for fr-FR.
• New package/Update-InstallerLocalization.ps1 runs the T4 templates headlessly with Visual Studio's TextTransform.exe, since $(SolutionDir) is not expanded outside VS. It normalizes line endings and keeps BOMs. Regenerating en-US/fr-FR/de-DE reproduces the committed files, so there is no drift apart from the new "generated, do not edit" header comment in the template output.
• Program.cs picks the installer UI language through a switch on the two-letter language code, like the Gateway installer.
• ci/package-assembled.ps1 (the local assemble script described in ci/README.md) was hardcoded to fr-FR. It now loops over Get-GatewayPackageLanguages/Get-PackageLanguages, so it also embeds the Gateway de-DE transform. The signed CI flow in package.yml does not use this script: it calls tlk.ps1 package -PackageOption generate|assemble, which already loops over the language lists, so adding sv-SE to tlk.ps1 is what covers it. The Gateway path was not run locally.
• Resources.sv.resx for the Desktop Agent is taken unchanged from feat(agent): add Swedish Desktop Agent localization #1984. It is a regular .NET satellite resource, and the installer already harvests the sv folder.
• Agent guidance: a section in AGENTS.md, a new installer-localization skill, and a Localization section in the installer README.

Testing:

• Regenerated all T4 output and confirmed a clean diff.
• Built the Agent MSI with dummy payloads: the full build embeds the 1036 and 1053 transforms with package languages 1033,1036,1053, and ci/package-assembled.ps1 agent produces the same result.
• Built the Desktop Agent and confirmed an sv satellite is produced.

I did not add a CI check that fails when generated files drift. It would need a Windows runner with Visual Studio's text templating component.

Note

Human-tuned, LLM-assisted content.

[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

[Copilot]

Copilot review overview

🔵 Needs a closer look

The Windows-only T4 generation and MSI transform embedding paths require confirmation from CI artifacts.

Review effort: Balanced
Findings: None

What changed in this PR

Adds Swedish localization for the Agent installer and Desktop Agent, while generalizing multilingual MSI assembly. No material static-review findings were identified.

Changes:

• Adds Swedish installer and tray resources.
• Embeds all configured language transforms.
• Documents and automates localization generation.

File	Description
package/​WindowsManaged/​Resources/​Strings.g.tt	Adds generated-file notice.
package/​WindowsManaged/​Resources/​DevolutionsGateway_fr-fr.wxl	Regenerates French localization.
package/​WindowsManaged/​Resources/​DevolutionsGateway_en-us.wxl	Regenerates English localization.
package/​WindowsManaged/​Resources/​DevolutionsGateway_de-de.wxl	Regenerates German localization.
package/​WindowsManaged/​README.md	Documents localization workflow.
package/​Update-InstallerLocalization.ps1	Adds localization regeneration script.
package/​AgentWindowsManaged/​Resources/​Strings.g.tt	Registers Swedish generation.
package/​AgentWindowsManaged/​Resources/​Strings_sv-SE.json	Adds Swedish installer strings.
package/​AgentWindowsManaged/​Resources/​DevolutionsAgent_sv-se.wxl	Adds generated Swedish WiX localization.
package/​AgentWindowsManaged/​Resources/​DevolutionsAgent_fr-fr.wxl	Regenerates French localization.
package/​AgentWindowsManaged/​Resources/​DevolutionsAgent_en-us.wxl	Regenerates English localization.
package/​AgentWindowsManaged/​README.md	Documents Agent regeneration command.
package/​AgentWindowsManaged/​Program.cs	Selects and embeds Swedish localization.
package/​AgentWindowsManaged/​DevolutionsAgent.csproj	Embeds the Swedish WiX resource.
package/​AgentWindowsManaged/​.gitignore	Ignores Swedish build outputs.
dotnet/​DesktopAgent/​Properties/​Resources.sv.resx	Adds Swedish Desktop Agent strings.
ci/​tlk.ps1	Registers Swedish packaging metadata.
ci/​package-assembled.ps1	Embeds every configured transform.
ci/​package-agent-windows.ps1	Updates generated-output documentation.
ci/​Build/​Build.psm1	Adds Swedish to Agent languages.
AGENTS.md	Establishes localization conventions.
.agents/​skills/​installer-localization/​SKILL.md	Adds installer-localization workflow guidance.

---

💡 Configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

[Richard Markiewicz (thenextman)]

Copilot review overview

🔵 Needs a closer look

The Windows-only T4 generation and MSI transform embedding paths require confirmation from CI artifacts.

I ran the .msi from CI with ProductLanguage=1053 and confirmed the localization for the installer looks good

[Benoît Cortier (CBenoit)]

issue: This is already a problem today, as-is, but I want to reduce the size of the AGENTS.md file in favor of smaller, targeted skills.

suggestion: Since you already added a skill, there is low value to this being here, and I suggest we don’t grow the top-level AGENTS.md file further.
As an alternative, I think it could be good to have that in a different AGENTS.md file living under package/ instead, or even better: under AgentWindowsManaged and WindowsManaged (duplicate the contents).

The reason is that I want to split Gateway and Agent in two repos, and these instructions are almost always relevant when modifying the installer specifically, and much less so when modifying the linux/Docker packages

[Richard Markiewicz (thenextman)]

Fixed, thanks!

[Benoît Cortier (CBenoit)]

LGTM