Add alignment option for the whole menu in the header area

[stefan-cotitosu]

What problem does this address?

If the primary menu has multiple items and it expands on two rows, there is no option to center all the items.

Currently, it can be done with CSS code, as the current alignment option is for the items themselves, not for the whole menu.

.nav-ul {
    justify-content: center;
}

What is your proposed solution?

Add an option for aligning the whole menu in the space it occupies within the header row.

Requested here - https://secure.helpscout.net/conversation/2191004513/362715/

[HardeepAsrani]

Just as a design feedback @mghenciu, do you think it will be helpful or if it's adding too many granual and specific option?

[mghenciu]

From a UIX pov, having a menu that goes on 2 lines isn't a good practice nor something very common. Meaning that if there are too many items, a mega menu is needed - not a 2 line menu.

But, from a consistency pov - the alignment should be present, as we have this option for the Footer menu:

Maybe there was a reason, to not include it in the first place.