Increase the character limit for suggestions

With only 2 000 characters to write and detail our suggestions in the discord it was already a headache, but with only half of it available in the forum, it's nightmarish.
That's especially true in case someone wants to post a dino-suggestion : describing the ideas about the animal was already hard to describe with just 2 000 characters available, but with now only 1 000 it has become impossible to do.