doc: Update from ISO languages database
* ISO_639: Remove Moldavian. Update Bihari, Bengali, Catalan,
Church Slavic, Divehi, Dzongkha, Ewe, Greek, Spanish, Fijian,
Gaelic, Hebrew, Interlingua, Indonesian, Inupiak, Central Khmer,
Kirghiz, Luxembourgish, Limburgan, Lao, Latvian, Norwegian Bokmal,
North Ndebele, Dutch, Norwegian Nynorsk, South Ndebele, Occitan,
Oromo, Pushto, Rundi, Romanian, Sango, Swati, South Sotho, Tswana,
Tonga, Uighur, Volapuk, Yiddish, and Zhuang.
