Change the euro sign encoding in newsletters

Ghost User
2019-11-13T22:00:35+01:00

Closes #960

#### Previous behaviour
Steps to reproduce:

1. Create a newsletter with an event that has a price or cancellation fee.
2. Send this newsletter to members.
3. The euro sign is not displayed correctly in the received ...

Closes #960 (closed)

Previous behaviour

Steps to reproduce:

1. Create a newsletter with an event that has a price or cancellation fee.

2. Send this newsletter to members.

3. The euro sign is not displayed correctly in the received newsletter.

New behaviour

Steps to validate that it works:

1. Create a newsletter with an event that has a price or cancellation fee.

2. Send this newsletter to members.

3. The euro sign is displayed correctly in the received newsletter.