for German, we have quite some issues getting good spell checking suggestions (see #731, #725 and others). One improvement is to rank the split suggestion of run-on words higher, e.g.
vorallem should suggest
vor allem. I'm now going to commit a patch that does that, but it breaks the Catalan tests. I'll fix those, but I'm not sure if my change introduces more issues than it fixes for Catalan. Please let me know (e.g. @jaumeortola). For German, I think it helps quite a bit. Other languages will also be affected, they just don't seem to have any test cases that get triggered by this change (except one for English, which I have commented out for now).