Interestingly enough, this Denglish habit is also a Dunglish one: splitting words in two to save space (time, being lazy, all kinds of reasons). The problem of course is that the author followed the rules of German instead of English. Both ‘Sunday’ and ‘holiday’ should be plural (there’s more than one in a year) and holiday is capitalised, again following German rules. That’s a lot of mistakes in five words. You could also debate that it should read ‘national holidays’, ‘public holidays’, ‘bank holidays’, someone stop me.
When in doubt, write it out or ask, just like for directions, it won’t hurt.
For anyone who wants to know why I was in Germany (shameless self-promotion), click here.