Feature request: Make the arrows changeable via config

[LukeWCS]

Hello

We (several phpBB admins) would like to be able to change the arrows in the config UI. We have to change this directly in the minified version every time Klaro is updated, which is both cumbersome and error-prone. There is no clear solution to this problem.

It would be extremely helpful if we simply had 2 new variables available in the configuration where we can change that.

Examples for config.js:

	cmModalUnfoldLabel: '▼',
	cmModalFoldLabel: '▲',

or

	cmModalUnfoldLabel: '(unfold)',
	cmModalFoldLabel: '(fold)',