make yaml files more consistent and feature complete

[qschneider]

changes

• make km271-for-friends.yaml and buderus-km271.yaml more consistent.
• added some missing entities.
• changed names of some entities. f.i. using "Aussentemperatur" instead of "Außentemperatur" to match it with "gedaempfte Aussentemperatur".
• added hc1_design_temperature to buderus-km271-writable.yaml but leave it commented out, because i don't know if its already working with current main branch.

see attached yaml.zip

Happy Holidays!

[qschneider]

made my first PR :-) https://github.com/the78mole/esphome_components/pull/42