To modify an existing languge translation, edit the lan_xx.txt file with a text editor that can modify Unicode (UTF8) strings. Don't use Microsoft Word to edit these files - it won't work. On Windows, use notepad.exe to edit and on Mac OS X, use TextEdit (in the Applications folder). Put lan_en.txt in a window on the left side of your screen and lan_xx.txt on the right side of your screen. Set the editor so the text doesn't wrap and each line on the left will match the line on the right.
If you only have a limited amount of time, edit sections 00, 01, 02, 07, 09, 11, 13, 15 and 16. These are the most visible parts of the user interface (buttons, menus, tabs, etc.) and it's only 319 lines to edit. This should take a native speaker an hour or two, and it will significantly improve the translation. You'll get a free Standard Edition license if you update the google translation for these 319 lines.
If you translate the whole file (1100 lines, 6000 words), you'll get a free Professional Edition license.
The lan_xx.txt files are located at:
Before you start work on a translation, check the translation status below to see if someone else is already working on it.
| Two-letter code | English name | Native name | Translation status |
| bg | Bulgarian | български | Native translation |
| zh | Chinese (Simplified) | 中文 (简体) | Native translation |
| tw | Chinese (Traditional) | 中文 (繁體) | Native translation |
| hr | Croatian | Hrvatski | Native translation |
| cs | Czech | česky | Native translation |
| da | Danish | dansk | Native translation |
| nl | Dutch | Nederlands | Native translation |
| en | English | English | Native |
| fi | Finnish | suomen kieli | Native translation |
| fr | French | français | Native translation |
| gl | Galician | Galego | Native translation |
| de | German | Deutsch | Native translation |
| el | Greek | Ελληνικά | Native translation |
| hi | Hindi | हिन्दी | Native translation |
| hu | Hungarian | Magyar | Native translation |
| it | Italian | Italiano | Native translation |
| ja | Japanese | 日本語 | Native translation |
| ko | Korean | 한국어 | Native translation |
| no | Norwegian | Norsk | Native translation |
| pt | Portuguese | Português | Native translation |
| pl | Polish | polski | Native translation |
| ro | Romanian | română | Native translation |
| ru | Russian | русский | Native translation |
| sr | Serbian | српски језик | Native translation |
| sk | Slovak | slovenčina | Native translation |
| es | Spanish | español | Native translation |
| sv | Swedish | Svenska | Native translation |
| ta | Tamil | தமிழ் | Native translation |
| tr | Turkish | Türkçe | Native translation |
| uk | Ukrainian | Українська | Native translation |
| Two-letter code | English name | Native name | Translation status |
| be | Belarusian | Беларуская | Being worked on |
| ca | Catalan | Català | Being worked on |
| et | Estonian | Eesti keel | Being worked on |
| he | Hebrew | עברית | Being worked on |
| id | Indonesian | Bahasa Indonesia | Being worked on |
| lv | Latvian | latviešu valoda | Being worked on |
| sl | Slovenian | slovenščina | Being worked on |
| Two-letter code | English name | Native name | Translation status |
| ar | Arabic | العربية | translate.google.com |
| lt | Lithuanian | lietuvių kalba | translate.google.com |
| tl | Tagalog | Tagalog | translate.google.com |
| th | Thai | ไทย | translate.google.com |
| vi | Vietnamese | Tiếng Việt | translate.google.com |
| Two-letter code | English name | Native name | Translation status |
| ab | Abkhazian | Аҧсуа | |
| aa | Afar | Afaraf | |
| af | Afrikaans | Afrikaans | |
| ak | Akan | Akan | |
| sq | Albanian | Shqip | |
| am | Amharic | አማርኛ | |
| ar | Arabic | العربية | translate.google.com |
| an | Aragonese | Aragonés | |
| hy | Armenian | Հայերեն | |
| as | Assamese | অসমীয়া | |
| av | Avaric | авар мацӀ | |
| ae | Avestan | avesta | |
| ay | Aymara | aymar aru | |
| az | Azerbaijani | azərbaycan dili | |
| bm | Bambara | bamanankan | |
| ba | Bashkir | башҡорт теле | |
| eu | Basque | euskara | |
| be | Belarusian | Беларуская | Being worked on |
| bn | Bengali | বাংলা | |
| bh | Bihari | भोजपुरी | |
| bi | Bislama | Bislama | |
| bs | Bosnian | bosanski jezik | |
| br | Breton | brezhoneg | |
| bg | Bulgarian | български | Native translation |
| my | Burmese | ဗမာစာ | |
| ca | Catalan | Català | Being worked on |
| ch | Chamorro | Chamoru | |
| ce | Chechen | нохчийн мотт | |
| ny | Chichewa | chiCheŵa | |
| zh | Chinese (Simplified) | 中文 (简体) | Native translation |
| tw | Chinese (Traditional) | 中文 (繁體) | Native translation |
| cu | Church Slavic | ѩзыкъ словѣньскъ | |
| cv | Chuvash | чӑваш чӗлхи | |
| kw | Cornish | Kernewek | |
| co | Corsican | corsu | |
| cr | Cree | ᓀᐦᐃᔭᐍᐏᐣ | |
| hr | Croatian | Hrvatski | Native translation |
| cs | Czech | česky | Native translation |
| da | Danish | dansk | Native translation |
| dv | Divehi | ދިވެހި | |
| nl | Dutch | Nederlands | Native translation |
| dz | Dzongkha | རྫོང་ཁ | |
| en | English | English | Native |
| eo | Esperanto | Esperanto | |
| et | Estonian | Eesti keel | Being worked on |
| ee | Ewe | Ɛʋɛgbɛ | |
| fo | Faroese | Føroyskt | |
| fj | Fijian | vosa Vakaviti | |
| fi | Finnish | suomen kieli | Native translation |
| fr | French | français | Native translation |
| ff | Fulah | Fulfulde | |
| gl | Galician | Galego | Native translation |
| lg | Ganda | Luganda | |
| ka | Georgian | ქართული | |
| de | German | Deutsch | Native translation |
| el | Greek | Ελληνικά | Native translation |
| gn | Guarani | Avañe'ẽ | |
| gu | Gujarati | ગુજરાતી | |
| ht | Haitian | Kreyòl ayisyen | |
| ha | Hausa | هَوُسَ | |
| he | Hebrew | עברית | Being worked on |
| hz | Herero | Otjiherero | |
| hi | Hindi | हिन्दी | Native translation |
| ho | Hiri Motu | Hiri Motu | |
| hu | Hungarian | Magyar | Native translation |
| is | Icelandic | Íslenska | |
| io | Ido | Ido | |
| ig | Igbo | Igbo | |
| id | Indonesian | Bahasa Indonesia | Being worked on |
| ia | Interlingua | Interlingua | |
| ie | Interlingue | Interlingue | |
| iu | Inuktitut | ᐃᓄᒃᑎᑐᑦ | |
| ik | Inupiaq | Iñupiaq | |
| ga | Irish | Gaeilge | |
| it | Italian | Italiano | Native translation |
| ja | Japanese | 日本語 | Native translation |
| jv | Javanese | basa Jawa | |
| kl | Kalaallisut | kalaallisut | |
| kn | Kannada | ಕನ್ನಡ | |
| kr | Kanuri | anuri | |
| ks | Kashmiri | कश्मीरी | |
| kk | Kazakh | Қазақ тілі | |
| km | Khmer | ភាសាខ្មែរ | |
| ki | Kikuyu | Gĩkũyũ | |
| rw | Kinyarwanda | Ikinyarwanda | |
| ky | Kirghiz | кыргыз тили | |
| rn | Kirundi | kiRundi | |
| kv | Komi | коми кыв | |
| kg | Kongo | KiKongo | |
| ko | Korean | 한국어 | Native translation |
| ku | Kurdish | Kurdî | |
| kj | Kwanyama | Kuanyama | |
| lo | Lao | ພາສາລາວ | |
| la | Latin | latine | |
| lv | Latvian | latviešu valoda | Being worked on |
| li | Limburgish | Limburgs | |
| ln | Lingala | Lingála | |
| lt | Lithuanian | lietuvių kalba | translate.google.com |
| lu | Luba-Katanga | Luba-Katanga | |
| lb | Luxembourgish | Lëtzebuergesch | |
| mk | Macedonian | македонски јазик | |
| mg | Malagasy | Malagasy fiteny | |
| ms | Malay | bahasa Melayu | |
| ml | Malayalam | മലയാളം | |
| mt | Maltese | Malti | |
| gv | Manx | Ghaelg | |
| mi | Maori | te reo Māori | |
| mr | Marathi | मराठी | |
| mh | Marshallese | Kajin M̧ajeļ | |
| mo | Moldavian | Limba moldovenească | |
| mn | Mongolian | Монгол | |
| na | Nauru | Ekakairũ Naoero | |
| nv | Navajo | Diné bizaad | |
| ng | Ndonga | Owambo | |
| ne | Nepali | नेपाली | |
| nd | North Ndebele | isiNdebele | |
| se | Northern Sami | Davvisámegiella | |
| nb | Norwegian Bokmal | Norsk bokmål | |
| nn | Norwegian Nynorsk | Norsk nynorsk | |
| no | Norwegian | Norsk | Native translation |
| oc | Occitan | Occitan | |
| oj | Ojibwa | ᐊᓂᔑᓈᐯᒧᐎᓐ | |
| or | Oriya | ଓଡ଼ିଆ | |
| om | Oromo | Afaan Oromoo | |
| os | Ossetian | Ирон æвзаг | |
| pi | Pali | पाऴि | |
| pa | Panjabi | ਪੰਜਾਬੀ | |
| ps | Pashto | پښتو | |
| fa | Persian | فارسی | |
| pl | Polish | polski | Native translation |
| pt | Portuguese | Português | Native translation |
| qu | Quechua | Runa Simi | |
| rm | Raeto-Romance | rumantsch grischun | |
| ro | Romanian | română | Native translation |
| ru | Russian | русский | Native translation |
| sm | Samoan | gagana fa'a Samoa | |
| sg | Sango | yângâ tî sängö | |
| sa | Sanskrit | संस्कृतम् | |
| sc | Sardinian | sardu | |
| gd | Scottish Gaelic | Gàidhlig | |
| sr | Serbian | српски језик | Native translation |
| sh | Serbo-Croatian | Srpskohrvatski | |
| sn | Shona | chiShona | |
| ii | Sichuan Yi | ꆇꉙ | |
| sd | Sindhi | सिन्धी | |
| si | Sinhala | සිංහල | |
| sk | Slovak | slovenčina | Native translation |
| sl | Slovenian | slovenščina | Being worked on |
| so | Somali | Soomaaliga | |
| st | Sotho | seSotho | |
| nr | South Ndebele | Ndébélé | |
| es | Spanish | español | Native translation |
| su | Sundanese | Basa Sunda | |
| sw | Swahili | Kiswahili | |
| ss | Swati | SiSwati | |
| sv | Swedish | Svenska | Native translation |
| tl | Tagalog | Tagalog | translate.google.com |
| ty | Tahitian | Reo Mā`ohi | |
| tg | Tajik | тоҷикӣ | |
| ta | Tamil | தமிழ் | Native translation |
| tt | Tatar | татарча | |
| te | Telugu | తెలుగు | |
| th | Thai | ไทย | translate.google.com |
| bo | Tibetan | བོད་ཡིག | |
| ti | Tigrinya | ትግርኛ | |
| to | Tonga | faka Tonga | |
| ts | Tsonga | xiTsonga | |
| tn | Tswana | seTswana | |
| tr | Turkish | Türkçe | Native translation |
| tk | Turkmen | Türkmen | |
| ug | Uighur | Uyƣurqə | |
| uk | Ukrainian | Українська | Native translation |
| ur | Urdu | اردو | |
| uz | Uzbek | O'zbek | |
| ve | Venda | tshiVenḓa | |
| vi | Vietnamese | Tiếng Việt | translate.google.com |
| vo | Volapuk | Volapük | |
| wa | Walloon | Walon | |
| cy | Welsh | Cymraeg | |
| fy | Western Frisian | Frysk | |
| wo | Wolof | Wollof | |
| xh | Xhosa | isiXhosa | |
| yi | Yiddish | ייִדיש | |
| yo | Yoruba | Yorùbá | |
| za | Zhuang | Saɯ cueŋƅ | |
| zu | Zulu | isiZulu |