Freedom in acknowledgments section of dissertation - writing in native language I am currently finishing writing my MSc thesis. I am considering separating the acknowledgments section in two:


Personal acknowledgments (sorted as advisor(s)/family/SO/friends)
Acknowledging financial support


Point 2 is straight forward. My issue is with point 1.

What kind of freedom do I have here?
My thesis is in English (not my nor the university's native language) so, am I allowed to, for example, write some paragraphs on my native language when I am acknowledging non-native English speakers?

Slightly different topic but do I have the freedom to write "inside references" that likely only the person who I am writing to will understand, when addressing friends or SO?

Essentially, what will be frowned upon by the referees in the acknowledgments section?
There are a couple directions to look to see how your school handles this sort of thing: 


Your supervisor probably has an idea of what's been done in the past. 
Theses in your school or department's library - school's keep past theses that have been accepted on record - have a look at what people in your school, department, and program have done in the past. 


In general - a quick survey of what my colleagues have used in the acknowledgements section of their master's theses has determined:


Inside jokes are ok. 
Multilingual messages are ok (we are in Canada though, so French and English is pretty common)
None of us believe the any of the referees bothered to read the personal acknowledgements.