After upgrading to 15.9.2 (SP1) and we have noticed a lot of the OOTB portlets and pages show a mix of languages for the field names.
The user is logged in as a French User, but some of the fields are not translating to French.
This may have been caused on the actual upgrade where something did not process correctly.
It has not been reproducible on other 15.9.2 sp 1 upgrades and may be environment specific.
Release : 15.9.2
Component : CLARITY STUDIO
The recommendation is to update each attribute/field manually when it is discovered.
There is no way to batch update these.
Steps to force the update:
Views/Fields on the specific page
Open the field and click Save and Return
That will push the updated translations out.
On custom objects you can push the translations from the Object properties itself. However on OOTB objects that is not available.