diff -r 5526d64e6def webtranslate/newgrf/language_file.py
--- a/webtranslate/newgrf/language_file.py	Mon May 25 17:14:35 2015 +0200
+++ b/webtranslate/newgrf/language_file.py	Mon May 25 17:59:35 2015 +0200
@@ -420,7 +420,7 @@
     @type plurals: C{list} of C{int}
 
     @ivar commands: String commands at each position.
-    @type commands: C{list} of C{ParameterInfo}
+    @type commands: C{list} of L{ParameterInfo}
 
     @ivar non_positionals: Mapping of commands without position to their count.
     @type non_positionals: C{dict} of C{str} to C{int}
@@ -614,8 +614,7 @@
         ok = True
         for pos, cmd in enumerate(self.commands):
             if cmd is None:
-                self.add_error(ErrorMessage(ERROR, None, "String parameter {} has no string command".format(pos)))
-                ok = False
+                self.commands[pos] = project_type.SKIP_PARAMETER;
         if ok:
             for pos in self.plurals:
                 if pos < 0 or pos >= len(self.commands):
@@ -1034,6 +1033,8 @@
         sc = project_type.NL_PARAMETER
     elif name == '{':
         sc = project_type.CURLY_PARAMETER
+    elif name == 'SKIP':
+        sc = project_type.SKIP_PARAMETER
     else:
         sc = projtype.text_commands.get(name)
         if sc is None: return True
diff -r 5526d64e6def webtranslate/project_type.py
--- a/webtranslate/project_type.py	Mon May 25 17:14:35 2015 +0200
+++ b/webtranslate/project_type.py	Mon May 25 17:59:35 2015 +0200
@@ -319,6 +319,7 @@
 
 NL_PARAMETER    = ParameterInfo("",  False, False, False, False, False)
 CURLY_PARAMETER = ParameterInfo("{", False, False, False, False, False)
+SKIP_PARAMETER  = ParameterInfo("SKIP", True, False, False, False, False)
 
 
 # Available project types, ordered by internal name.