Rename "Night mode" to "Dark theme" #5169
Description
In zulip/zulip#20228, we renamed "night mode" to "dark theme" in the web app and the Help center. We should make the mobile app theme name consistent with the web app as well.
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In zulip/zulip#20228, we renamed "night mode" to "dark theme" in the web app and the Help center. We should make the mobile app theme name consistent with the web app as well.