How can I change my mssql database default language?

Databases > MS SQL 2012
The default language for SQL Login is English, if you would like change it to your own country's language, please follow the steps below to adjust it.

1. Login to your database with sql server management studio

2. Run query

ALTER LOGIN [SQL Login] WITH DEFAULT_LANGUAGE = your language

Note:
1. replace  "[SQL Login]"  with your database login name.
2. The Database Engine contains the following installed languages: here

e.g. change to French

ALTER LOGIN DB_9B091A_demo_admin WITH DEFAULT_LANGUAGE = French