To open the Externalize Strings wizard, do one of the following:
Note: Externalizing strings is undoable (with the same restrictions as for refactorings). Use Refactor > Undo from the menu bar to undo externalizing strings.
String Externalization
Eclipse string externalization mechanism
Externalizing Strings
Undoing a refactoring operation
Redoing a refactoring operation
Key/value page
Property file page