In my MZ-Tools package I use dynamic localization to avoid the official way to localize .vsct files. So, I use the TextChanges CommandFlag for UI items and I set the text at run-time using the BeforeQueryStatus event handler. While this works fine for most UI items, alas, it doesn’t work for toolbars. I have documented it here:

BUG: TextChanges CommandFlag not honored for toolbars in Visual Studio packages
http://www.mztools.com/articles/2014/MZ2014026.aspx

and this is the Microsoft Connect bug report:

“TextChanges” CommandFlag not honored for toolbars in Visual Studio packages (VS SDK)
https://connect.microsoft.com/VisualStudio/feedbackdetail/view/966908