Entity types starting with an underscore are displayed strangely on right-to-left transcriptions

1. Update the orientation of one of the Balsac Annotated transcriptions (or any other transcription that has entities with a {"subtype": "_something"} in their metas) to horizontal-rl or vertical-rl
2. Open its element in the frontend

Using something like a b as the subtype does nothing abnormal, but using __________a__ will cause the leading underscores to be displayed at the end of the Token. The subtypes used for Balsac Annotated all start with underscore so the issue becomes quickly visible.