If you use the command 
chcp in your windows command terminal it should give you the used code page of it.  
850 is  "
Multilingual Latin 1; Western European" and should support 
romance language group chars, which i guess is yours part of. You could try and set your WIN cmd with the command 
chcp 65001 to utf-8 and see if its works then.
No. Renpy has in the 
encoding dir a good number of them.
These 
english letters are commonly called latin alphabet. 

 The english use them just 1:1...
Other european nations have some additions or changes. The only other alphabets  in  (part) europe are greek and cyrillic and not in code page ibm850 or windows1252 included.