Language is controlled by the browser, not the device, for Fireflox:
Tools>Options>Content
Chrome I believe is Options> Under the Bonnet > Web Content > Languages & Spellchecker settings (I advise not using Chrome on Xerox devices, they just don't play well with each other, not sure why, I use Chrome for day-to-day, but Firefox and IE with the printers)
Template appears to be a corruption, the kind of thing you would see if using a corrupted clone file, or a clone from another device or a major firmware change, in the case of the Connectkey machines like this one, it would be a clone from a firmware that starts with 071(Connectkey 1.0) applied to one starting with 072(Connectkey 1.5) If that is the case, there will probably be no fix except an ALTboot to scrape all settings. I will keep digging for information and update if and when I find a resolution (Not easy without either finding a way to break mine the same way, or finding another report of someone who has actually resolved it)
<Edit> Is it possible there was a non-standard (English) keyboard used for that particular entry with the symbol? Something like "ă" for instance? It could be the system doesn't recognise the character and is faulting it, but that is entirely a guess. It would give me something to throw at some devices to see about recreating the issue.