Problem using Spanish Characters

I have a website (www.golyfutbol.com) in Spanish. It was working fine and today it has a problem using spanish characters. No updates done, no nothing (went to bed working fine, this morning had serious issues). It simply decided that instead of saying “opinión” y would say “opinión”. The same issue for every spanish character (ñ, ó,á, etc).

Checked for support and found that it might be a problem with the line in WP-CONFIG.PHP like this
Instead of
define(‘DB_CHARSET’, ‘utf8’);
it should read
define(‘DB_CHARSET’, ‘utf-8’);
[note the dash before the 8].

That worked, and my posts can now be read. But when looking at the dashboard or the tweet app (or essentially anything else) the problem remains.
Moreover, the widgets were in a left column sidebar. By themselves, they changed to the right and some simply dissapeared.

I would really appreciate any help. I am no expert, but I am trying to learn. My theme is Elbee Elgee. Thank you.