fix: managed event type string

[ritiksharmarj]

What does this PR do?

Fixes #12883
Fix the text "count_members" from the team's managed event types. We don't have "count_members" or "count_members_one" or "count_members_other" in the locales to set count.

Demo

Type of change

• Bug fix (non-breaking change which fixes an issue)

How should this be tested?

• Go to event types page
• Select managed event in the team event list or create new team event and select managed event
• Check "Assignment" tab

Mandatory Tasks

• Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.

Checklist

• I haven't added tests that prove my fix is effective or that my feature works

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[github-actions]

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[emrysal]

I changed the PR to keep the feature with the right translation string; it wasn't count_member but number_member (which has incorrect naming, but here we are)

[emrysal]

Fixes issue :)