SQLCMD command is not able to insert accents
Another option, one which I've just learned, comes from the sqlcmd documentation. You need to set the codepage for sqlcmd to match that of the file encoding. In the case of UTF-8, the codepage is 65001 so you'd want:

SQLCMD -S .\MSSQLSERVER08 -V 17 -E -i %~dp0\aqualogyDB.sql -o %~dp0\databaseCreationLog.log 
-f 65001