The messages growthexperiments-homepage-mentorship-about-mentor-par1 and -par2 discuss a mentor in third person. If I understand correctly, these messages refer to a specific, known user, and it's not just a generic person. In some languages, it would be much better to describe that user using their gender, with correct pronouns and verb forms. Many other GrowthExperiments have gender support for both the mentor and the mentee, so these messages should support it, too.
The following message keys need to support mentor gender as well:
For mentees: (patch)
https://translatewiki.net/wiki/MediaWiki:Growthexperiments-homepage-mentorship-preintro/en
https://translatewiki.net/wiki/MediaWiki:Growthexperiments-homepage-mentorship-about-subheader-mentor/en
https://translatewiki.net/wiki/MediaWiki:Growthexperiments-homepage-mentorship-optout-text/en
https://translatewiki.net/wiki/MediaWiki:Growthexperiments-tour-mentor-response-tip-personal-title/en
https://translatewiki.net/wiki/MediaWiki:Growthexperiments-help-panel-button-header-ask-help-mentor/en
For mentors (patch):
https://translatewiki.net/wiki/MediaWiki:Growthexperiments-mentor-dashboard-mentor-tools-away-dialog-text/en
https://translatewiki.net/wiki/MediaWiki:Growthexperiments-mentor-dashboard-mentor-tools-info-text/en
https://translatewiki.net/wiki/MediaWiki:Growthexperiments-mentor-dashboard-resources-link-how-to-introduce/en
https://translatewiki.net/wiki/MediaWiki:Growthexperiments-mentor-dashboard-mentee-overview-info-legend-questions/en
https://translatewiki.net/wiki/MediaWiki:Growthexperiments-claimmentee-confirm/en