Formatting, minor code fixes and typos

[m417z]

The first commit is larger, but it contains only whitespace changes.

[m417z]

@louking it has a pretty narrow usage, only for date filtering, so the chances are low, but you're right that it can potentially break somebody's custom code.

I can either revert this part, or it can be documented in the release notes of the next version. Let's see what @vedmack says.

[vedmack]

Hi @m417z Except for the class typo fix all looks great, please revert the class renaming and I will merge it

[vedmack]

@m417z I resolved the conflicts in the js file, so no problems merging (after you revert the css class typo back)

[m417z]

Done, I also added the fix you reverted.