Add check for .mo files and more verbose errors (#515)

validate-spice

@@ -31,7 +31,9 @@ def validate_xlet(uuid):
         for _, _, files in os.walk(f'files/{uuid}'):
             if (any(ext.endswith('.po') for ext in files) and not
                     any(ext.endswith('.pot') for ext in files)):
-                raise CheckError("Invalid location for translation files!")
+                raise CheckError(f"Invalid location for translation files! (Move any .po or .pot to files/{uuid}/po)")
+            if any(ext.endswith(".mo") for ext in files):
+                raise CheckError(f"Translation files should not be compiled! (Delete any .mo files in {uuid})")
 
         if f"{uuid}{SPICE_EXT}" not in os.listdir('.'):
             raise CheckError(f"Missing main {SPICE_EXT} file")