And you will have to look into weewx.conf. Here are my adoptions:
[Station]
# Start of week (0=Monday, 6=Sunday)
week_start = 0
[StdReport]
...
[[Defaults]]
[[[Units]]]
...
[[[[Labels]]]]
day = " Tag", " Tage"
hour = " Stunde", " Stunden"
minute = " Minute", " Minuten"
second = " Sekunde", " Sekunden"
...
[[[Labels]]]
# Set to hemisphere abbreviations suitable for your location:
hemispheres = N, S, O, W
# Generic labels, keyed by an observation type.
[[[[Generic]]]]
barometer = Barometer
dewpoint = Taupunkt
ET = ET
heatindex = Hitzeindex
inHumidity = Innenluftfeuchte
inTemp = Innentemperatur
outHumidity = Luftfeuchte
outTemp = Außentemperatur
radiation = Sonnenstrahlung
rain = Regen
rainRate = Regenrate
UV = UV Index
windDir = Windrichtung
windGust = Böen
windGustDir = Böenrichtung
windSpeed = Windgeschwindigkeit
windchill = Windchill
windgustvec = Böenvektor
windvec = Windvektor
[[[Almanac]]]
# The labels to be used for the phases of the moon:
moon_phases = Neumond, zunehmende Sichel, zunehmender Halbmond, zweites Viertel, Vollmond, drittes Viertel, abnehmender Halbmond, abnehmende Sichel
All of the rest I found in the skin files, so far I could find it.
Hope, that helps
-Peter