BL-5855 Prevent forgetting page label change
BL-5855 Prevent forgetting page label change

* was due to not updating the data-i18n attribute
* another possible solution would be to delete the
   attribute when changing the page label on the 
   premise that we don't want to try localizing random
   template page labels from the user... but we might
   want to and they may change it back to something
   we already know how to localize.
StephenMcConnel/BloomDesktop,BloomBooks/BloomDesktop,BloomBooks/BloomDesktop,BloomBooks/BloomDesktop,andrew-polk/BloomDesktop,andrew-polk/BloomDesktop,StephenMcConnel/BloomDesktop,andrew-polk/BloomDesktop,andrew-polk/BloomDesktop,StephenMcConnel/BloomDesktop,gmartin7/myBloomFork,StephenMcConnel/BloomDesktop,gmartin7/myBloomFork,StephenMcConnel/BloomDesktop,BloomBooks/BloomDesktop,andrew-polk/BloomDesktop,gmartin7/myBloomFork,BloomBooks/BloomDesktop,gmartin7/myBloomFork,gmartin7/myBloomFork,BloomBooks/BloomDesktop,andrew-polk/BloomDesktop,StephenMcConnel/BloomDesktop,gmartin7/myBloomFork