tr()-Fixes in CLANG code model.

Do not use QObject::tr(), use native file paths,
use complete contexts.

Change-Id: Icc4990b4c2ca5b9ae6f6b639db9e1a45a93e0a65
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/clangcodemodel/clangmodelmanagersupport.cpp

@@ -53,7 +53,8 @@ QString ModelManagerSupport::id() const
 
 QString ModelManagerSupport::displayName() const
 {
-    return QCoreApplication::translate("ModelManagerSupport::displayName",
+    //: Display name
+    return QCoreApplication::translate("ClangCodeModel::Internal::ModelManagerSupport",
                                        "Clang");
 }