Yes, AFAIK each time we change a string the l10n team need to be aware about there is a string that has changed so we need to alter the key of the string (I was referring to the key when I said index, sorry) to allow localizers to know *something has changed*. So you should replace `widget-no-sim2-meta` with something like `widget-no-sim3-meta`. But please note these same strings are being used in the module in a dynamic way so you probably need to change `widget-no-sim2-heading` as well.

I know in Spanish and English a dot does not make a big difference but I don't know the impact it could have in other languages. If you want, let's wait for l10n review. :)