My CADLock, Inc. colleague, Owen Wengerd has posted about a fix utility he has written to help clean up drawings infested with the language pack problem discussed here. I have not yet tested Owen’s utility*, but as this should run in any AutoCAD-based product from 2007 on, it could well be a better partial solution than Autodesk’s Civil 3D-only (so far) patches. Autodesk still needs to sort out its dodgy templates, of course, and should probably provide its own non-Civil 3D fixes, if only to maintain a little corporate self-respect.
As Owen has a long and distinguished history of being consistently and demonstrably better at AutoCAD programming than Autodesk’s own programmers, I’d be tempted to try this one first. However, Civil 3D users should probably apply the patches and updates anyway to help resolve other issues.
* Edit: I have now tested it, and it works beautifully in both AutoCAD 2010 and Civil 3D 2011.