By default, SQL Developer uses the default language of the operating system, e.g.
in Windows platform, the language settings in Regional and Language Options.

There are two ways to change the GUI language in SQL Developer.
1. Change the regional settings .
  In Windows go to Control Panel -> Regional and Language Options
(This also affects the language used on your computer and other applications and you may need to restart machine to be effective)

2.  Edit \sqldeveloper\bin\sqldeveloper.conf file
 - Add/modify the following parameters:

AddVMOption -Duser.language=en
AddVMOption -Duser.country=US
AddVMOption -Duser.region=US

Then, restart the SQL Developer

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