* only set data entries if given (avoid "n/a")
* use untranslated value ids for wind direction and pressure tendency
* pass float/double values as float/double, not strings
First round of clean-up
Also remove complex lookup of values when setting data
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Branched from the monolithic repo kde-workspace, frameworks branch, at commit
049113e719dd2fc4446d054fa1a3aada330094f0