Bad choice to put the same "topic" token in various strings: if a language needs to put it at the beginnig of its version it should be capitalized, otherwise not; this way translators have to make a choice once for all

Moreover, description refers to an "untranslated" string that clearly is no more untranslated; please uptade it with
https://translations.telegram.org/en/tdesktop/unsorted/lng_action_topic_renamed