wierd non-css descriptions as class names

[flicksolutions]

In src/lib/components/erlaeuterungen-components/ErlaeuterungenFassungsedition.svelte and src/lib/components/erlaeuterungen-components/ErlaeuterungenTranskriptionen.svelte we find wierd classNames. Check where they come from and replace or delete them.

Farbe: rot is definetly not a css class. a space and a colon?
See this thread for css-class naming rules: https://stackoverflow.com/questions/448981/which-characters-are-valid-in-css-class-names-selectors

Originally posted by @flicksolutions in #287 (review)

[domsteinbach]

Confirmend. The html contains the weird class names
https://parzival.unibe.ch/transkriptionen/d/5/29 -> l.5.29
<span class="content"><span class="tei-seg9 initial Farbe: rot">D</span>o clagete man in ſere.</span>