Minimize jump on Special:NewLexeme when lemma language field is hidden.
With JS enabled the lemma language field is only shown if the language
cannot be derived from the lexeme language. Since the field needs to be
visible for users with JS disabled, it is hidden via JS on page load.
The "jump" occurs due to the field being visible while ResourceLoader is
pulling in dependencies and then disappears once everything is loaded.
This patch takes the naive approach of avoiding ResourceLoader by
inlining the part of the script that hides the field, thereby
minimizing the jump.