[FIX] tools: export UTF-8 characters
[FIX] tools: export UTF-8 characters

- Install Babel 2.3.4 as specified in the `requirements.txt`
- In a Python file, do not add the line `# -*- coding: utf-8 -*-`
- Create a translatable string with a non-ASCII character, e.g.
`Amount in €`
- Export the translation

The exported term is incorrect: `Amount in â¬`.

Since the default encoding for Python 3 is UTF-8, it is logical for the
Babel extraction to use it as a default encoding.

The issue was solved in Babel 2.4.0 with commit:

https://github.com/python-babel/babel/commit/33a8fc40d417b401162e2d20021fcbebcc4ab7db

opw-1984480

closes odoo/odoo#33671

Signed-off-by: Nicolas Martinelli (nim) <771435c469f83f6aa9c405ac5e1ed06314a94f2d@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo