Where would I find a list of locale name abbreviations for my project localization folders? (Such as en for English, fr for French).
I am looking to do German, Spanish and others.
You can just call them English.lproj, Spanish.lproj, etc.
The "abbreviated names" are actually IETF language tags (i.e. BCP 47), except that you use pt_PT.lproj instead of pt-PT.lproj.
The actual interpretation routine is in https://github.com/apple/swift-corelibs-foundation/blob/master/CoreFoundation/PlugIn.subproj/CFBundle_Locale.c, determined by the CFBundleGetLocalizationInfoForLocalization function. Replicated here:
| lproj identifiers | L# | C# | Display name |
|:-------------------------------|:----|:----|:---------------------------|
| en_US = en = English | 0 | 0 | English (United States) |
| en_GB | 0 | 2 | English (United Kingdom) |
| en_AU | 0 | 15 | English (Australia) |
| en_CA | 0 | 82 | English (Canada) |
| en_SG | 0 | 100 | English (Singapore) |
| en_IE | 0 | 108 | English (Ireland) |
| fr_FR = fr = French | 1 | 1 | French (France) |
| fr_CA | 1 | 11 | French (Canada) |
| fr_CH | 1 | 18 | French (Switzerland) |
| fr_BE | 1 | 98 | French (Belgium) |
| de_DE = de = German | 2 | 3 | German (Germany) |
| de_CH | 2 | 19 | German (Switzerland) |
| de_AT | 2 | 92 | German (Austria) |
| it_IT = it = Italian | 3 | 4 | Italian (Italy) |
| it_CH | 3 | 36 | Italian (Switzerland) |
| nl_NL = nl = Dutch | 4 | 5 | Dutch (Netherlands) |
| nl_BE | 34 | 6 | Dutch (Belgium) |
| sv_SE = sv = Swedish | 5 | 7 | Swedish (Sweden) |
| es_ES = es = Spanish | 6 | 8 | Spanish (Spain) |
| es_XL | 6 | 86 | Spanish (Latin America) |
| da_DK = da = Danish | 7 | 9 | Danish (Denmark) |
| pt_BR = pt = Portuguese | 8 | 71 | Portuguese (Brazil) |
| pt_PT | 8 | 10 | Portuguese (Portugal) |
| nb_NO = nb = no = Norwegian | 9 | 12 | Norwegian Bokmål (Norway) |
| nn_NO = nn = Nynorsk | 151 | 101 | Norwegian Nynorsk (Norway) |
| he_IL = he = Hebrew | 10 | 13 | Hebrew (Israel) |
| ja_JP = ja = Japanese | 11 | 14 | Japanese (Japan) |
| ar = Arabic | 12 | 16 | Arabic |
| fi_FI = fi = Finnish | 13 | 17 | Finnish (Finland) |
| el_GR = el = Greek | 14 | 20 | Greek (Greece) |
| el_CY | 14 | 23 | Greek (Cyprus) |
| is_IS = is = Icelandic | 15 | 21 | Icelandic (Iceland) |
| mt_MT = mt = Maltese | 16 | 22 | Maltese (Malta) |
| tr_TR = tr = Turkish | 17 | 24 | Turkish (Turkey) |
| hr_HR = hr = Croatian | 18 | 68 | Croatian (Croatia) |
| zh_TW = zh-Hant | 19 | 53 | Chinese (Taiwan) |
| zh_CN = zh = zh-Hans = Chinese | 33 | 52 | Chinese (China) |
| ur_PK = ur = Urdu | 20 | 34 | Urdu (Pakistan) |
| ur_IN | 20 | 96 | Urdu (India) |
| hi_IN = hi = Hindi | 21 | 33 | Hindi (India) |
| th_TH = th = Thai | 22 | 54 | Thai (Thailand) |
| ko_KR = ko = Korean | 23 | 51 | Korean (South Korea) |
| lt_LT = lt = Lithuanian | 24 | 41 | Lithuanian (Lithuania) |
| pl_PL = pl = Polish | 25 | 42 | Polish (Poland) |
| hu_HU = hu = Hungarian | 26 | 43 | Hungarian (Hungary) |
| et_EE = et = Estonian | 27 | 44 | Estonian (Estonia) |
| lv_LV = lv = Latvian | 28 | 45 | Latvian (Latvia) |
| se = Sami | 29 | 46 | Northern Sami |
| fo_FO = fo = Faroese | 30 | 47 | Faroese (Faroe Islands) |
| fa_IR = fa = Farsi | 31 | 48 | Persian (Iran) |
| ru_RU = ru = Russian | 32 | 49 | Russian (Russia) |
| ga_IE = ga = Irish | 35 | 50 | Irish (Ireland) |
| sq = Albanian | 36 | -1 | Albanian |
| ro_RO = ro = Romanian | 37 | 39 | Romanian (Romania) |
| cs_CZ = cs = Czech | 38 | 56 | Czech (Czech Republic) |
| sk_SK = sk = Slovak | 39 | 57 | Slovak (Slovakia) |
| sl_SI = sl = Slovenian | 40 | 66 | Slovenian (Slovenia) |
| yi = Yiddish | 41 | -1 | Yiddish |
| sr_CS = sr = Serbian | 42 | 65 | Serbian (Serbia) |
| mk_MK = mk = Macedonian | 43 | 67 | Macedonian (Macedonia) |
| bg_BG = bg = Bulgarian | 44 | 72 | Bulgarian (Bulgaria) |
| uk_UA = uk = Ukrainian | 45 | 62 | Ukrainian (Ukraine) |
| be_BY = be = Byelorussian | 46 | 61 | Belarusian (Belarus) |
| uz_UZ = uz = Uzbek | 47 | 99 | Uzbek (Uzbekistan) |
| kk = Kazakh | 48 | -1 | Kazakh |
| hy_AM = hy = Armenian | 51 | 84 | Armenian (Armenia) |
| ka_GE = ka = Georgian | 52 | 85 | Georgian (Georgia) |
| mo = Moldavian | 53 | -1 | Moldavian |
| ky = Kirghiz | 54 | -1 | Kyrgyz |
| tg = Tajiki | 55 | -1 | Tajik |
| tk = Turkmen | 56 | -1 | Turkmen |
| mn = Mongolian | 58 | -1 | Mongolian |
| ps = Pashto | 59 | -1 | Pashto |
| ku = Kurdish | 60 | -1 | Kurdish |
| ks = Kashmiri | 61 | -1 | Kashmiri |
| sd = Sindhi | 62 | -1 | Sindhi |
| bo = Tibetan | 63 | 105 | Tibetan |
| ne_NP = ne = Nepali | 64 | 106 | Nepali (Nepal) |
| sa = Sanskrit | 65 | -1 | Sanskrit |
| mr_IN = mr = Marathi | 66 | 104 | Marathi (India) |
| bn = Bengali | 67 | 60 | Bengali |
| as = Assamese | 68 | -1 | Assamese |
| gu_IN = gu = Gujarati | 69 | 94 | Gujarati (India) |
| pa = Punjabi | 70 | 95 | Punjabi |
| or = Oriya | 71 | -1 | Oriya |
| ml = Malayalam | 72 | -1 | Malayalam |
| kn = Kannada | 73 | -1 | Kannada |
| ta = Tamil | 74 | -1 | Tamil |
| te = Telugu | 75 | -1 | Telugu |
| si = Sinhalese | 76 | -1 | Sinhala |
| my = Burmese | 77 | -1 | Burmese |
| km = Khmer | 78 | -1 | Khmer |
| lo = Lao | 79 | -1 | Lao |
| vi_VN = vi = Vietnamese | 80 | 97 | Vietnamese (Vietnam) |
| id = Indonesian | 81 | -1 | Indonesian |
| tl = Tagalog | 82 | -1 | Tagalog |
| ms = Malay | 83 | -1 | Malay |
| am = Amharic | 85 | -1 | Amharic |
| ti = Tigrinya | 86 | -1 | Tigrinya |
| om = Oromo | 87 | -1 | Oromo |
| so = Somali | 88 | -1 | Somali |
| sw = Swahili | 89 | -1 | Swahili |
| rw = Kinyarwanda | 90 | -1 | Kinyarwanda |
| rn = Rundi | 91 | -1 | Rundi |
| Nyanja | 92 | -1 | Nyanja |
| mg = Malagasy | 93 | -1 | Malagasy |
| eo = Esperanto | 94 | 103 | Esperanto |
| cy = Welsh | 128 | 79 | Welsh |
| eu = Basque | 129 | -1 | Basque |
| ca_ES = ca = Catalan | 130 | 73 | Catalan (Spain) |
| la = Latin | 131 | -1 | Latin |
| qu = Quechua | 132 | -1 | Quechua |
| gn = Guarani | 133 | -1 | Guarani |
| ay = Aymara | 134 | -1 | Aymara |
| tt = Tatar | 135 | -1 | Tatar |
| ug = Uighur | 136 | -1 | Uyghur |
| dz_BT = dz = Dzongkha | 137 | 83 | Dzongkha (Bhutan) |
| jv = Javanese | 138 | -1 | Javanese |
| su = Sundanese | 139 | -1 | Sundanese |
| gl = Galician | 140 | -1 | Galician |
| af_ZA = af = Afrikaans | 141 | 102 | Afrikaans (South Africa) |
| br = Breton | 142 | 77 | Breton |
| iu_CA = iu = Inuktitut | 143 | 78 | Inuktitut (Canada) |
| gd = Scottish | 144 | 75 | Scottish Gaelic |
| gv = Manx | 145 | 76 | Manx |
| to_TO = to = Tongan | 147 | 88 | Tongan (Tonga) |
| grc | 148 | 40 | Ancient Greek |
| kl = Greenlandic | 149 | 107 | Kalaallisut |
| az = Azerbaijani | 150 | -1 | Azerbaijani |
Here:
zh_HK and Traditional Chinese (both have same code number as zh_TW), probably through the more sophisticated CFLocale list. As of iOS 10.3.1, the following list of lproj names are actually used by Apple: