fix column type

ki/models.py

@@ -188,7 +188,7 @@ class ProfileLanguage(db.Model):
     __tablename__ = "profile_language"
 
     profile_id = Column(Integer, ForeignKey("profile.id"), primary_key=True)
-    language_id = Column(Integer, ForeignKey("language.id"), primary_key=True)
+    language_id = Column(String(2), ForeignKey("language.id"), primary_key=True)
     level = Column(SmallInteger, nullable=False)
 
     profile = relationship("Profile", back_populates="languages")