( Un)predictive text

I sometimes worry about what my predictive text says about me. Am I right in thinking that predictive text builds up a profile of the words you commonly use , to predict what you might be trying to type ? If so my language must be pretty extreme. I've just sent thanks to a lovely lady in Germany , thanking her for her prompt reply to a message I'd just sent.  Showing off my schooldays German , I thought I'd attempt it in her mother tongue . The intended ' Vielen Dank' for 'Many Thanks' was immediately warped into ' Violent Drunk' . The poor woman was only trying to help , she must think us Brits are a pretty torrid lot.