But maybe it would be better to do it like this, as each phrase set would be together and cleaner code:

    my $language = "de";
        # ar, bs, de, en, es, fr, it, nl, pl, pt, ru, sk, sv, tet, tr,
+ uk, zh
    
    my %windTranslation = (
        'en'    => "Wind:",
        'de'    => "Wind:",
        'es'    => "Viento:",
        'fr'    => "Vent:",
        'nl'    => "Wind:",
    );
    
    my %humidityTranslation = (
        'en'    => "Humidity:",
        'de'    => "Feuchtigkeit:",
        'es'    => "Humedad:",
        'fr'    => "Humidité:",
        'nl'    => "Vochtigheid:",
    );
    
    my $windPhrase        = $windTranslation{$language};
    my $humidityPhrase    = $humidityTranslation{$language};
[download]

Or is there maybe a better way, that I am not thinking of?

This is at least better than a huge bunch of if-then-else.

NetWallah++ is right, you better use a locale library.

my %translations=(
    en => {
        wind => 'wind',
        humidity => 'humidity'
        # ...
    },
    de => {
        wind => 'Wind',
        humidity => 'Feuchtigkeit',
        # ...
    },
    # ...
);

print $translations{$language}->{'wind'},':';
[download]

Alternatively, you can use the terms as first-level keys and the language as second-level key:

my %translations=(
    wind => {
        en => 'wind',
        de => 'Wind',
        # ...
    },
    humidity => {
        en => 'humidity',
        de => 'Feuchtigkeit',
        # ...
    },
    # ...
);

print $translations{'wind'}->{$language},':';
[download]

Alexander