Android-N で Chris からのコード リファレンスを実行し、新しい言語のリストを取得しました。
af_NA [Afrikaans (Namibia)]
agq_CM [Aghem (Cameroon)]
ak_ [Akan]
ak_GH [Akan (Ghana)]
am_ [Amharic]
ar_ [Arabic]
ar_001 [Arabic (World)]
ar_BH [Arabic (Bahrain)]
ar_DJ [Arabic (Djibouti)]
ar_EG [Arabic (Egypt)]
ar_EH [Arabic (Western Sahara)]
ar_ER [Arabic (Eritrea)]
ar_IQ [Arabic (Iraq)]
ar_KW [Arabic (Kuwait)]
ar_LB [Arabic (Lebanon)]
ar_MR [Arabic (Mauritania)]
ar_OM [Arabic (Oman)]
ar_PS [Arabic (Palestine)]
ar_SA [Arabic (Saudi Arabia)]
ar_SD [Arabic (Sudan)]
ar_SY [Arabic (Syria)]
ar_TD [Arabic (Chad)]
ar_YE [Arabic (Yemen)]
as_ [Assamese]
as_IN [Assamese (India)]
asa_TZ [Asu (Tanzania)]
az_ [Azerbaijani (Latin)]
az_ [Azerbaijani]
az_AZ [Azerbaijani (Cyrillic,Azerbaijan)]
az_AZ [Azerbaijani (Latin,Azerbaijan)]
bas_ [Basaa]
be_ [Belarusian]
bem_ZM [Bemba (Zambia)]
bez_TZ [Bena (Tanzania)]
bg_BG [Bulgarian (Bulgaria)]
bn_BD [Bengali (Bangladesh)]
bo_ [Tibetan]
bo_CN [Tibetan (China)]
bo_IN [Tibetan (India)]
br_ [Breton]
brx_ [Bodo]
bs_ [Bosnian (Latin)]
bs_ [Bosnian]
bs_BA [Bosnian (Cyrillic,Bosnia & Herzegovina)]
ca_IT [Catalan (Italy)]
ce_RU [Chechen (Russia)]
cgg_ [Chiga]
chr_ [Cherokee]
chr_US [Cherokee (United States)]
cs_ [Czech]
cy_ [Welsh]
cy_GB [Welsh (United Kingdom)]
da_DK [Danish (Denmark)]
da_GL [Danish (Greenland)]
dav_ [Taita]
dav_KE [Taita (Kenya)]
de_AT [German (Austria)]
de_BE [German (Belgium)]
de_CH [German (Switzerland)]
de_DE [German (Germany)]
de_LI [German (Liechtenstein)]
dje_ [Zarma]
dua_ [Duala]
dyo_ [Jola-Fonyi]
dyo_SN [Jola-Fonyi (Senegal)]
dz_ [Dzongkha]
ebu_ [Embu]
ebu_KE [Embu (Kenya)]
ee_ [Ewe]
ee_GH [Ewe (Ghana)]
el_ [Greek]
el_CY [Greek (Cyprus)]
en_ [English]
en_001 [English (World)]
en_150 [English (Europe)]
en_AS [English (American Samoa)]
en_AU [English (Australia)]
en_BB [English (Barbados)]
en_BI [English (Burundi)]
en_BS [English (Bahamas)]
en_BW [English (Botswana)]
en_BZ [English (Belize)]
en_CX [English (Christmas Island)]
en_DE [English (Germany)]
en_DG [English (Diego Garcia)]
en_DK [English (Denmark)]
en_DM [English (Dominica)]
en_FI [English (Finland)]
en_FM [English (Micronesia)]
en_GB [English (United Kingdom)]
en_GD [English (Grenada)]
en_GG [English (Guernsey)]
en_GH [English (Ghana)]
en_GI [English (Gibraltar)]
en_GU [English (Guam)]
en_GY [English (Guyana)]
en_IL [English (Israel)]
en_IM [English (Isle of Man)]
en_IN [English (India)]
en_IO [English (British Indian Ocean Territory)]
en_KE [English (Kenya)]
en_KY [English (Cayman Islands)]
en_LS [English (Lesotho)]
en_MO [English (Macau)]
en_MP [English (Northern Mariana Islands)]
en_MU [English (Mauritius)]
en_MW [English (Malawi)]
en_MY [English (Malaysia)]
en_NA [English (Namibia)]
en_NF [English (Norfolk Island)]
en_NR [English (Nauru)]
en_NZ [English (New Zealand)]
en_PG [English (Papua New Guinea)]
en_PH [English (Philippines)]
en_PK [English (Pakistan)]
en_PW [English (Palau)]
en_RW [English (Rwanda)]
en_SB [English (Solomon Islands)]
en_SC [English (Seychelles)]
en_SE [English (Sweden)]
en_SH [English (St. Helena)]
en_SI [English (Slovenia)]
en_SS [English (South Sudan)]
en_SX [English (Sint Maarten)]
en_SZ [English (Swaziland)]
en_TK [English (Tokelau)]
en_TT [English (Trinidad & Tobago)]
en_TV [English (Tuvalu)]
en_TZ [English (Tanzania)]
en_UM [English (U.S. Outlying Islands)]
en_VC [English (St. Vincent & Grenadines)]
en_WS [English (Samoa)]
en_ZM [English (Zambia)]
en_ZW [English (Zimbabwe)]
es_BO [Spanish (Bolivia)]
es_CL [Spanish (Chile)]
es_CO [Spanish (Colombia)]
es_DO [Spanish (Dominican Republic)]
es_ES [Spanish (Spain)]
es_GT [Spanish (Guatemala)]
es_IC [Spanish (Canary Islands)]
es_MX [Spanish (Mexico)]
es_NI [Spanish (Nicaragua)]
es_PA [Spanish (Panama)]
es_PE [Spanish (Peru)]
es_PH [Spanish (Philippines)]
es_PR [Spanish (Puerto Rico)]
es_PY [Spanish (Paraguay)]
es_US [Spanish (United States)]
es_UY [Spanish (Uruguay)]
et_ [Estonian]
et_EE [Estonian (Estonia)]
eu_ [Basque]
eu_ES [Basque (Spain)]
ewo_ [Ewondo]
ewo_CM [Ewondo (Cameroon)]
fa_ [Persian]
fa_AF [Persian (Afghanistan)]
fa_IR [Persian (Iran)]
ff_ [Fulah]
ff_CM [Fulah (Cameroon)]
ff_GN [Fulah (Guinea)]
ff_MR [Fulah (Mauritania)]
ff_SN [Fulah (Senegal)]
fi_ [Finnish]
fi_FI [Finnish (Finland)]
fil_ [Filipino]
fil_PH [Filipino (Philippines)]
fo_ [Faroese]
fo_DK [Faroese (Denmark)]
fo_FO [Faroese (Faroe Islands)]
fr_BE [French (Belgium)]
fr_BF [French (Burkina Faso)]
fr_BL [French (St. Barthélemy)]
fr_CA [French (Canada)]
fr_CD [French (Congo (DRC))]
fr_CF [French (Central African Republic)]
fr_CG [French (Congo (Republic))]
fr_CH [French (Switzerland)]
fr_CM [French (Cameroon)]
fr_DJ [French (Djibouti)]
fr_DZ [French (Algeria)]
fr_FR [French (France)]
fr_GF [French (French Guiana)]
fr_GQ [French (Equatorial Guinea)]
fr_HT [French (Haiti)]
fr_MA [French (Morocco)]
fr_MC [French (Monaco)]
fr_MF [French (St. Martin)]
fr_MG [French (Madagascar)]
fr_ML [French (Mali)]
fr_MQ [French (Martinique)]
fr_MR [French (Mauritania)]
fr_MU [French (Mauritius)]
fr_NC [French (New Caledonia)]
fr_NE [French (Niger)]
fr_PM [French (St. Pierre & Miquelon)]
fr_RE [French (Réunion)]
fr_RW [French (Rwanda)]
fr_SN [French (Senegal)]
fr_YT [French (Mayotte)]
fy_ [Western Frisian]
ha_ [Hausa]
ha_GH [Hausa (Ghana)]
ha_NE [Hausa (Niger)]
hi_ [Hindi]
hr_ [Croatian]
hr_HR [Croatian (Croatia)]
hu_ [Hungarian]
hy_ [Armenian]
hy_AM [Armenian (Armenia)]
in_ [Indonesian]
in_ID [Indonesian (Indonesia)]
iw_ [Hebrew]
ja_ [Japanese]
ja_JP [Japanese (Japan)]
kab_DZ [Kabyle (Algeria)]
kde_TZ [Makonde (Tanzania)]
kk_ [Kazakh]
kk_KZ [Kazakh (Kazakhstan)]
kl_ [Kalaallisut]
kln_KE [Kalenjin (Kenya)]
km_KH [Khmer (Cambodia)]
kn_ [Kannada]
kok_ [Konkani]
ks_ [Kashmiri]
ks_IN [Kashmiri (India)]
ksb_TZ [Shambala (Tanzania)]
ksf_ [Bafia]
ksf_CM [Bafia (Cameroon)]
ksh_ [Colognian]
ksh_DE [Colognian (Germany)]
ky_KG [Kyrgyz (Kyrgyzstan)]
lag_ [Langi]
lg_ [Ganda]
lkt_US [Lakota (United States)]
ln_ [Lingala]
ln_AO [Lingala (Angola)]
lo_LA [Lao (Laos)]
lrc_ [Northern Luri]
lrc_IQ [Northern Luri (Iraq)]
lrc_IR [Northern Luri (Iran)]
lt_ [Lithuanian]
lt_LT [Lithuanian (Lithuania)]
lu_ [Luba-Katanga]
luo_ [Luo]
luy_KE [Luyia (Kenya)]
mer_ [Meru]
mfe_ [Morisyen]
mgh_ [Makhuwa-Meetto]
mk_ [Macedonian]
mn_ [Mongolian]
ms_SG [Malay (Singapore)]
mua_ [Mundang]
mua_CM [Mundang (Cameroon)]
my_MM [Burmese (Myanmar (Burma))]
naq_ [Nama]
nb_SJ [Norwegian Bokmål (Svalbard & Jan Mayen)]
nl_BQ [Dutch (Caribbean Netherlands)]
nl_CW [Dutch (Curaçao)]
nl_SR [Dutch (Suriname)]
nl_SX [Dutch (Sint Maarten)]
nnh_CM [Ngiemboon (Cameroon)]
nus_SS [Nuer (South Sudan)]
nyn_UG [Nyankole (Uganda)]
or_IN [Oriya (India)]
os_RU [Ossetic (Russia)]
pa_ [Punjabi (Gurmukhi)]
pl_ [Polish]
ps_AF [Pashto (Afghanistan)]
pt_ [Portuguese]
pt_PT [Portuguese (Portugal)]
qu_EC [Quechua (Ecuador)]
rm_ [Romansh]
rn_ [Rundi]
ro_ [Romanian]
rof_ [Rombo]
rof_TZ [Rombo (Tanzania)]
ru_ [Russian]
ru_KZ [Russian (Kazakhstan)]
ru_RU [Russian (Russia)]
rw_ [Kinyarwanda]
rwk_ [Rwa]
sah_RU [Sakha (Russia)]
se_SE [Northern Sami (Sweden)]
seh_ [Sena]
seh_MZ [Sena (Mozambique)]
sk_SK [Slovak (Slovakia)]
sl_SI [Slovenian (Slovenia)]
smn_FI [Inari Sami (Finland)]
sn_ZW [Shona (Zimbabwe)]
so_DJ [Somali (Djibouti)]
so_ET [Somali (Ethiopia)]
so_KE [Somali (Kenya)]
so_SO [Somali (Somalia)]
sq_MK [Albanian (Macedonia (FYROM))]
sr_BA [Serbian (Cyrillic,Bosnia & Herzegovina)]
sr_ME [Serbian (Latin,Montenegro)]
sr_RS [Serbian (Latin,Serbia)]
sr_XK [Serbian (Cyrillic,Kosovo)]
sv_ [Swedish]
sv_AX [Swedish (Åland Islands)]
sv_FI [Swedish (Finland)]
sw_ [Swahili]
sw_TZ [Swahili (Tanzania)]
ta_ [Tamil]
teo_ [Teso]
teo_KE [Teso (Kenya)]
th_ [Thai]
th_TH [Thai (Thailand)]
to_ [Tongan]
twq_ [Tasawaq]
twq_NE [Tasawaq (Niger)]
uk_UA [Ukrainian (Ukraine)]
ur_PK [Urdu (Pakistan)]
uz_ [Uzbek (Cyrillic)]
uz_UZ [Uzbek (Cyrillic,Uzbekistan)]
vai_ [Vai]
vai_LR [Vai (Vai,Liberia)]
wae_ [Walser]
xog_UG [Soga (Uganda)]
yav_ [Yangben]
yo_BJ [Yoruba (Benin)]
zh_HK [Chinese (Simplified Han,Hong Kong)]
zh_HK [Chinese (Traditional Han,Hong Kong)]
zh_MO [Chinese (Simplified Han,Macau)]
zh_MO [Chinese (Traditional Han,Macau)]
ケルンに朗報です。アプリはケルシュ (ksh_DE [ケルン語]) に翻訳できます。