I realize that most punctuation marks and numbers are already ignored by the platform, which is a great idea. However I noticed that there are still some cases in which they are regarded as words. So far I’ve spotted the following:
German:
- Angle quotes: » «
 - Numbers with symbols like: 100%, $500, €350, etc.
 
Spanish:
- Angle quotes: « »
 - Curly quotes: “ ”
 - Numbers with symbols like: 100%, $500, €350, etc.
 

