fix: APP-383 align create project button

[r41ph]

Description

https://regennetwork.atlassian.net/browse/APP-383

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How to test

1. Check '+ Create project' button is aligned as expected both when users are logged in and not logged in.
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[blushi]

I know this wasn't part of the task, but we should probably also adjust the language switcher position. Now that "create project" is aligned with the menu items on the left, it looks quite bad when user is logged in:

Is this a quick fix or should we create another task?

I think the actual issue is that when logged in, the menu items are not centered vertically:

[r41ph]

Is this a quick fix or should we create another task?

I think it'd probably be easier to do it in this task. I'll have a quick look and let you know.

[r41ph]

@erikalogie @blushi please have a look, I have aligned the language switcher too.

[erikalogie]

LGTM!