fix(instant): remove language-preload if there were used within instant

This removes automatically async loading if a language table was not
found.

In the startup phase, this leads the browser being seriously engaged to
load the language an enormous amount of times in parallel.

In detail: For each call of `instant()` (read: for each filter), a dedicated `loadAsyc()` will be invoked unless the translation was already loaded. In the startup phase, it is not loaded, which means for every filter an invoke will be started.. which seems to crash the browser right now.