The language the user's operating system is running in. Returned by Application.systemLanguage.
| Afrikaans | Afrikaans. | 
| Arabic | Arabic. | 
| Basque | Basque. | 
| Belarusian | Belarusian. | 
| Bulgarian | Bulgarian. | 
| Catalan | Catalan. | 
| Chinese | Chinese. | 
| Czech | Czech. | 
| Danish | Danish. | 
| Dutch | Dutch. | 
| English | English. | 
| Estonian | Estonian. | 
| Faroese | Faroese. | 
| Finnish | Finnish. | 
| French | French. | 
| German | German. | 
| Greek | Greek. | 
| Hebrew | Hebrew. | 
| Icelandic | Icelandic. | 
| Indonesian | Indonesian. | 
| Italian | Italian. | 
| Japanese | Japanese. | 
| Korean | Korean. | 
| Latvian | Latvian. | 
| Lithuanian | Lithuanian. | 
| Norwegian | Norwegian. | 
| Polish | Polish. | 
| Portuguese | Portuguese. | 
| Romanian | Romanian. | 
| Russian | Russian. | 
| SerboCroatian | Serbo-Croatian. | 
| Slovak | Slovak. | 
| Slovenian | Slovenian. | 
| Spanish | Spanish. | 
| Swedish | Swedish. | 
| Thai | Thai. | 
| Turkish | Turkish. | 
| Ukrainian | Ukrainian. | 
| Vietnamese | Vietnamese. | 
| ChineseSimplified | ChineseSimplified. | 
| ChineseTraditional | ChineseTraditional. | 
| Unknown | Unknown. | 
| Hungarian | Hungarian. | 
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