Help me find the right translation app for my product // Looking for a SaaS thingy [I will not promote]

Context: I have an application where we currently deal with translations in-house (We fetch translations from Google translate and cache them in Redis before serving them to the UI) It's getting out of hand so I'd like to swap it out for an off the shelf solution so that my engineers can focus on 'real problems'. Previously I've used Transifex and Lokalise, and I'm open to others - I'm not loyal to any particular thing. **# The requirement** Here's what's different here: I'm looking for the means to over-ride a translation for a specific user segment. I'm kind of looking for a cross between Lokalise and FlagSmith if you see what I mean. For example, my app might have a string that says \`Hello\`, and that might be automatically translated to Spanish speakers to \`Hola\`, but I might have one customer that wants to over-ride that to say \`Hola amigos\` just for their segment/organisation. Does such a thing exist, or do I simply need to get over the fact that I'll have to handle having the additional keys/overrides in my app code? Thanks!