Administrators can set the default language that is applied to all spaces in your confluence site. Note that a separate user can select their own language attributes in their own properties.
Set the default language
To modify the default language in the Confluence site:
In the upper-right corner of the screen, click the console button , and then select the general Configuration link.
In the left panel, under Configuration options, select Language (Languages).
Select Edit and then select the default language you want to apply in your confluence site.
Confluence has the following languages installed by default:
? E?tina (? Eskárepublika | Czech Republic)
Deutsch (Deutschland | Germany)
Eesti (Eesti | Estonia)
中文版 (UK)
中文版 (US)
Espa?ol (Espa?a | Spain)
Fran?ais (France)
Íslenska (Ísland | Iceland)
Italiano (Italia | Italy)
Magyar (Magyarország | Hungary)
Nederlands (Nederland | The Netherlands)
Norsk (Norge | Norway)
Polski (Polska | Poland)
Português (Brasil | Brazil)
Roman? (Romania | Romania)
Sloven?ina (Slovenskárepublika | Slovak Republic)
Suomi (Suomi | Finland)
Svenska (Sverige | Sweden)
Русский (россия| Russia)
English (United Kingdom | China)
Japanese (Japan | Japan)
??? (???? | Republic of Korea)
Https://www.cwiki.us/display/CONFLUENCEWIKI/Choosing+a+Default+Language
Confluence 6 Select a default language