Out-of-the-box, Fluid Topics provides its interface in the following languages:
| Language | Code |
|---|---|
| Chinese (China) | zh-CN |
| Chinese (Taiwan) | zh-TW |
| English (USA) | en-US |
| French (France) | fr-FR |
| German (Germany) | de-DE |
| Italian | it-IT |
| Japanese | ja-JP |
| Korean | ko-KR |
| Portuguese (Portugal) | pt-PT |
| Spanish (Spain) | es-ES |
These languages are known as Translated languages in the Languages menu.
The Administration menu is only available in four languages: English, French, German and Japanese.
Fluid Topics also makes it possible for ADMIN and PORTAL_ADMIN users to add interface translations for the following languages (see Customize interface messages):
| Language | Code |
|---|---|
| Bulgarian | bg-BG |
| Czech | cs-CZ |
| Danish | da-DK |
| Dutch | nl-NL |
| Dutch (Belgium) | nl-BE |
| English (UK) | en-UK |
| Estonian | et-EE |
| Finnish | fi-FI |
| French (Belgium) | fr-BE |
| French (Canada) | ft-CA |
| French (Switzerland) | fr-CH |
| German (Austria) | de-AT |
| German (Switzerland) | de-CH |
| Greek | el-GR |
| Hungarian | hu-HU |
| Icelandic | is-IS |
| Indonesian | id-ID |
| Latvian | lv-LV |
| Lithuanian | lt-LT |
| Norwegian | no-NO |
| Norwegian (Bokmål) | nb-NO |
| Polish | pl-PL |
| Portuguese (Brazil) | pt-BR |
| Romanian | ro-RO |
| Russian | ru-RU |
| Russian (Ukraine) | ru-UA |
| Slovak | sk-SK |
| Slovenian | sl-SI |
| Spanish (Latin American) | es-419 |
| Spanish (Mexico) | es-MX |
| Swedish | sv-SE |
| Swedish (Finland) | sv-FI |
| Thai | th-TH |
| Turkish | tr-TR |
| Ukrainian | uk-UA |
| Vietnamese | vi-VN |
These languages are known as Untranslated languages in the Languages menu.
When adding an untranslated language, it is necessary to manually add translations for all labels in the interface. Interface labels without translation default to the fallback language.