Release 1.59

What's Changed

• ALTAPPS-1252: Shared, iOS topic completion wow screen by @ivan-magda in #1061
• ALTAPPS-1264: Shared update challenge model by @XanderZhu in #1059
• ALTAPPS-1231: Android fix <sup> tag rendering in ChoiceStepQuiz by @XanderZhu in #1062
• ALTAPPS-1266: Shared remove short theory experiment by @ivan-magda in #1064
• ALTAPPS-1253: Android topic completion screen by @XanderZhu in #1063
• Release 1.59 by @ivan-magda in #1060

Full Changelog: v1.58...v1.59