diff --git a/src/opengnsys/workers/oglive_worker.py b/src/opengnsys/workers/oglive_worker.py
index e775c8a..e365f6d 100644
--- a/src/opengnsys/workers/oglive_worker.py
+++ b/src/opengnsys/workers/oglive_worker.py
@@ -239,9 +239,10 @@ class ogLiveWorker(ServerWorker):
     def interfaceAdmin (self, method, parametros=[]):
         exe = '{}/{}'.format (self.pathinterface, method)
         ## for development only. Will be removed when the referenced bash code (/opt/opengnsys/lib/engine/bin/*.lib) is translated into python
+        LANG = os.environ.get ('LANG', 'en_GB.UTF-8').replace ('UTF_8', 'UTF-8')
         devel_bash_prefix = f'''
             PATH=/opt/opengnsys/scripts/:$PATH;
-            source /opt/opengnsys/etc/lang.{os.environ.get ('LANG', 'en_GB.UTF-8')}.conf;
+            source /opt/opengnsys/etc/lang.{LANG}.conf;
             for I in /opt/opengnsys/lib/engine/bin/*.lib; do source $I; done;
             for i in $(declare -F |cut -f3 -d" "); do export -f $i; done;
         '''