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Use dynamic menu titles for most toggle items

Closes #935
Upload to existing release if it already exists

Creating a release with attachment is non-atomic in that the release is first created and then we upload to that release but our build file has it as a single action, so this action should be able to handle partial success from a previous execution.
Ensure text view find operations use values from the UI

We already commit the values when focus is lost, but it’s possible to initiate a find operation while focus is still in the find dialog text fields (via the menu).

Fixes #1183