Fix character encoding of mongo database

[Fattigman]

Problem: Two fields are strangely formatted in the database: "nextclade" and "selection_criterion"

• nextclade: inserts \" at the beginning and end of some of the fields.
• selection_criterion: parses swedish character and encodes them to utf-8.

Solution:

• Rewrite the perl scripts which loads the data into the database.
• We will then migrate the language to english.