Fix duplicate 'triggered' text in Logbook context messages (#23083)

[ellegamee]

Proposed change

This PR improves the readability of Logbook entries by removing redundant "triggered" text that often appears twice when automations are run manually or via certain services.

In many languages (like Swedish or German), this creates grammatically awkward sentences where a localized "Triggered by" is followed by a hardcoded English "triggered" from the backend. By filtering out the exact string "triggered" from the context_message, the UI remains clean while still allowing other important context messages to be displayed.

Screenshots

Before in German:

After in German:

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Logbook: Duplicated "triggered" in entries when using "Run actions" for automations #23083
• This PR is related to issue or discussion:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to backend pull request:

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

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• I have reviewed two other open pull requests in this repository.

[MindFreeze]

This looks like it is removing more than just the "triggered" suffix

[silamon]

I don't think this is the way to go. The triggered comes from a suffix in the replacement and I guess it makes sense to fix it properly.

[MindFreeze]

The original code extracted the trigger source from either item.context_source or from item.context_message.replace("triggered by ", "") and then localized it via localizeTriggerSource. The new code removes this entire branch, so the useful source of the trigger is no longer rendered at all. The fix removes information rather than removing the duplicate.

[home-assistant]

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