textapi: put a label on sequence items
# Feature Request ## Description see title this is in common with recent improvements in [TextAPI](https://subugoe.pages.gwdg.de/emo/text-api/page/specs/#sequence-object) and TIDO. Source: https://chat.gwdg.de/group/Ahiqar?msg=ASpZprZEfK92EXuhR ## User Story As a smart front end developer I want to prevent a massive number of requests in order to improve the performance ot the application. /cc [Michelle Weidling](https://gitlab.gwdg.de/mrodzis)
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