Added some synonymous terms for `covers` and `skip_words`

[LorenzKahl]

Spelling References:

• https://www.duden.de/rechtschreibung/Markise
• https://de.wikipedia.org/wiki/Raffstore

[home-assistant[bot]]

Hi LorenzKahl

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Thanks!

[mib1185]

as long as @Scorpoon is the only language lead for German, he should still approve this pr, too 🙂