On SP16 Patch 1...
I do not believe that the localizing is working the way I think it should, but I wanted to ask all of you with more expertise than I have.
I created a region for US.
I created a region for Canada.
Created a page when locale is set (in WPC) to US/English.
Localized the page for Canada/English (new teaser specific to this region).
Localized the page for Canada/French. (has French version of Teaser).
User defaulted in UME with language of English.
When user has their region set to US, sees US/English version.
User changes their region to Canada (but leaves their language set to English), sees Canada/English version.
User changes their language to French -- still sees Canada/English version.
I would think that when the user changes their language, the localized page changes.
Just for grins, I created a CanadaEnglish region and a CanadaFrench region.
Each region has pages with their respective language. If the user changes their region from CanadaEnglish to CanadaFrench, then it works.
Am I misunderstanding how it should work?