Refactor language handling in Weather API

Improved the language initialization logic by replacing the
experimental `given/when` construct with a more standard
`if/elsif` structure, enhancing code readability and
maintainability. The attribute handling in the `Attr` subroutine
was also refactored for clarity, removing unnecessary usage
of `given/when`, which helps reduce complexity throughout
the codebase.

In the OpenWeatherMapAPI module, the logic for handling
weather response data was streamlined by removing `given/when`
statements in favor of `if` conditions. This change avoids
potential confusion and enhances the clarity of the code logic.
No breaking changes were introduced; the overall functionality
remains intact.

lib/FHEM/APIs/Weather/wundergroundAPI.pm

@@ -6,7 +6,6 @@ use FHEM::Meta;
 
 use POSIX;
 use HttpUtils;
-use experimental qw /switch/;
 use Encode;
 
 my $META = {};