i18n: remove redundant entries

[alba4k]

Removes unneeded entries, as previously discussed, to make stuff less cluttered.

    // zh (Simplified Chinese)
    engine.registerEntry("zh", TXT_KEY_SEARCH_SOMETHING, "搜索...");

Would xy count as fallback when looking for xy_ANYTHING? is it hyprutils looking for a xy prefix or xy_?

[vaxerski]

it works as a fallback, but also because there is no zh_ZH.