"Big whoop," you may think, "you just replaced hardcoded strings with variables."
In some cases, yes. In others, we had to work around hardcoded string interpolation, devise methods of swapping out strings based on other variables, standardise new APIs to do all this with...
@batbeeps that rules! i've worked on localization processes and they're nothing to take lightly 💖
Oh, and also it had to work in a way that's backwards compatible with hundreds of existing http://GOV.UK services (some of them partially translated), be WCAG 2.1 AA compilant, and… most painfully of all, it even works in Internet Explorer 8.