General language file cleanup

Marlin/language_an.h

Marlin/language_bg.h

Marlin/language_ca.h

Marlin/language_cn.h

Marlin/language_cz.h

Marlin/language_da.h

Marlin/language_es.h

Marlin/language_eu.h

Marlin/language_fi.h

Marlin/language_fr.h

Marlin/language_gl.h

Marlin/language_it.h

Marlin/language_kana.h

Marlin/language_kana_utf8.h

Marlin/language_nl.h

Marlin/language_pl.h

Marlin/language_pt-br.h

Marlin/language_pt-br_utf8.h

Marlin/language_pt.h

Marlin/language_pt_utf8.h