add lang to user table in db

backend/tracim_backend/migration/versions/a143b60aad61_add_lang_to_user.py

+"""add lang to user
+
+Revision ID: a143b60aad61
+Revises: 78b52ca39419
+Create Date: 2018-08-20 10:17:14.859250
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'a143b60aad61'
+down_revision = '78b52ca39419'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('users', sa.Column('lang', sa.Unicode(length=3), nullable=True))  # nopep8
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('users', 'lang')
+    # ### end Alembic commands ###

backend/tracim_backend/models/auth.py

     is_active = Column(Boolean, default=True, nullable=False)
     is_deleted = Column(Boolean, default=False, nullable=False, server_default=sqlalchemy.sql.expression.literal(False))
     imported_from = Column(Unicode(32), nullable=True)
+    # timezone as tz database format
     timezone = Column(Unicode(255), nullable=False, server_default='')
+    # lang in iso639 format
+    lang = Column(Unicode(3), nullable=True, default=None)
     # TODO - G.M - 04-04-2018 - [auth] Check if this is already needed
     # with new auth system
     auth_token = Column(Unicode(255))