Install de_DE locale on azure

azure/setup.yml

@@ -10,6 +10,7 @@ steps:
       sudo -u postgres psql -c "ALTER USER postgres PASSWORD 'postgres';"
       sudo -u postgres psql -c "CREATE DATABASE test;"
       docker exec sql1 /opt/mssql-tools/bin/sqlcmd -S 127.0.0.1 -U SA -P "<YourStrong@Passw0rd>" -Q "create login pdo_test with password='password', check_policy=off; create user pdo_test for login pdo_test; grant alter, control to pdo_test;"
+      sudo locale-gen de_DE
     displayName: 'Setup'
   - script: ./azure/setup-slapd.sh
     displayName: 'Configure slapd'