This adds a check that the translation for a project title exists before adding the current project type to the create header menu ("New Project +" menu).

@dju90 reported an issue where a broken menu button was adding when viewing a Mix&Move project outside of the curriculum:

@molly-moen shared helpful context that "if a project type isn't in the list but you are on the standalone project, we try to put it in the menu."

A potential easy follow-up here is also adding a block or allow list which would effectively hide this particular project type if desired, even if we did have a translation string and thumbnail available. For now this just aims to fix the rendering issue by hiding the button.

Note that with this change other labs types can still be inserted to the top of the menu if we have a string:

Links

• Slack thread: https://codedotorg.slack.com/archives/C03DBDN67B7/p1767770776070239

Testing story

Deployment strategy

Follow-up work

Privacy

Security

Caching

PR Creation Checklist:

• Tests provide adequate coverage
• Privacy impacts have been documented
• Security impacts have been documented
• Code is well-commented
• New features are translatable or updates will not break translations
• Relevant documentation has been added or updated
• User impact is well-understood and desirable
• Follow-up work items (including potential tech debt) are tracked and linked