Steps to reproduce:
- Open a resx file with localizations, e.g. Test.resx with existing Test.de.resx and Test.it.resx.
- "neutral Value" is shown as the column header for the localized value
- switch Culture to "de"
- still "neutral Value" is shown as the column header for the localized value though it should show "de Value"
Attached is a patch, which calls RefreshButtonState after the selection of a new culture to keep the header in sync with the selected culture.