regex: remove all other languages except en_us in catalog cache json

"(bg_bg|cs_cz|da_dk|de_de|el_gr|en_gb|es_es|es_mx|fi_fi|fr_ca|fr_fr|hu_hu|id_id|it_it|ja_jp|ko_kr|nb_no|nl_nl|pl_pl|pt_br|pt_pt|ru_ru|sk_sk|sv_se|tr_tr|uk_ua|zh_cn|zh_tw|neutral)": ".*"(?:,|\n)(\s+)

with fixing trailing commas:

,\n(\s+)\}, => \n    },