docs(core): update the i18n design doc (#31609)
docs(core): update the i18n design doc (#31609)

PR Close #31609

ocombe/angular,matsko/angular,sarunint/angular,mhevery/angular,alexeagle/angular,mhevery/angular,vikerman/angular,angular/angular,snaptech/angular,sarunint/angular,ocombe/angular,brandonroberts/angular,Brocco/angular,angular-indonesia/angular,manekinekko/angular,brandonroberts/angular,filipesilva/angular,Brocco/angular,angular-indonesia/angular,brandonroberts/angular,alxhub/angular,wKoza/angular,mhevery/angular,IdeaBlade/angular,mgechev/angular,shairez/angular,gdi2290/angular,ocombe/angular,snaptech/angular,IdeaBlade/angular,manekinekko/angular,matsko/angular,matsko/angular,mgechev/angular,Toxicable/angular,JiaLiPassion/angular,filipesilva/angular,gnomeontherun/angular,mprobst/angular,Brocco/angular,angular/angular,alexeagle/angular,sarunint/angular,sarunint/angular,angular/angular,vikerman/angular,snaptech/angular,StephenFluin/angular,manekinekko/angular,snaptech/angular,ocombe/angular,gnomeontherun/angular,angular/angular,angular-indonesia/angular,wKoza/angular,matsko/angular,Brocco/angular,gkalpak/angular,mgechev/angular,JiaLiPassion/angular,manekinekko/angular,angular-indonesia/angular,StephenFluin/angular,mhevery/angular,Toxicable/angular,gnomeontherun/angular,mprobst/angular,vikerman/angular,IdeaBlade/angular,blesh/angular,snaptech/angular,gkalpak/angular,alxhub/angular,gdi2290/angular,brandonroberts/angular,gkalpak/angular,Toxicable/angular,Toxicable/angular,mprobst/angular,gdi2290/angular,IdeaBlade/angular,mgechev/angular,alxhub/angular,mgechev/angular,Brocco/angular,shairez/angular,alexeagle/angular,JiaLiPassion/angular,manekinekko/angular,mprobst/angular,blesh/angular,mhevery/angular,StephenFluin/angular,Toxicable/angular,gkalpak/angular,Brocco/angular,wKoza/angular,gdi2290/angular,Toxicable/angular,ocombe/angular,snaptech/angular,blesh/angular,shairez/angular,mprobst/angular,brandonroberts/angular,matsko/angular,alxhub/angular,StephenFluin/angular,wKoza/angular,wKoza/angular,alexeagle/angular,gdi2290/angular,mhevery/angular,shairez/angular,alxhub/angular,manekinekko/angular,alexeagle/angular,vikerman/angular,blesh/angular,gnomeontherun/angular,filipesilva/angular,filipesilva/angular,JiaLiPassion/angular,wKoza/angular,sarunint/angular,sarunint/angular,vikerman/angular,brandonroberts/angular,IdeaBlade/angular,mprobst/angular,gdi2290/angular,ocombe/angular,StephenFluin/angular,blesh/angular,vikerman/angular,alexeagle/angular,filipesilva/angular,shairez/angular