Add more US spelling rules

doc/.vale/gitlab/British.yml

@@ -98,6 +98,8 @@ swap:
   speciality: specialty
   spectre: specter
   splendour: splendor
+  standardise: standardize
+  standardised: standardized
   sulphur: sulfur
   theatre: theater
   travelled: traveled

doc/development/fe_guide/development_process.md

@@ -4,7 +4,7 @@ You can find more about the organization of the frontend team in the [handbook](
 
 ## Development Checklist
 
-The idea is to remind us about specific topics during the time we build a new feature or start something. This is a common practice in other industries (like pilots) that also use standardised checklists to reduce problems early on.
+The idea is to remind us about specific topics during the time we build a new feature or start something. This is a common practice in other industries (like pilots) that also use standardized checklists to reduce problems early on.
 
 Copy the content over to your issue or merge request and if something doesn't apply simply remove it from your current list.