fix(frontend): Use uppercase event type for generic events without translation keys

[amanape]

• [ ] This change is worth documenting at https://docs.all-hands.dev/
• [ ] Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

End-user friendly description of the problem this fixes or functionality this introduces.

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Summarize what the PR does, explaining any non-trivial design decisions. This renders better titles for new or unaccounted events instead of a non-existent translation key

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Link of any specific issues this addresses:

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To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:f8e8305-nikolaik   --name openhands-app-f8e8305   docker.all-hands.dev/all-hands-ai/openhands:f8e8305

[openhands-staging[bot]]

Looks like there are a few issues preventing this PR from being merged!

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@OpenHands please fix the failing actions on PR #8671

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