Begin of the insertion### Steps to reproduce

1. Login as a user in the mobile app
2. Check the navigation bar

### What is the buggy behavior?

* End of the insertion The Begin of the insertionbuttonEnd of the insertion add Begin of the insertion"+"End of the insertion Begin of the deletion iconEnd of the deletion is Begin of the insertionnot visible at allEnd of the insertion Begin of the deletion missingEnd of the deletion in the Begin of the insertionnavigation barEnd of the insertion Begin of the deletion header on smaller screens, preventing users from adding new projectsEnd of the deletion

Begin of the insertion### What is the expected behavior?

1. By reducing the margins and paddings between elements in the navigation bar as specified in the visuals we generate space to include a 24x24px "+" button

### Screenshots and other files

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/35175/content">

Figma: https://www.figma.com/file/GgNKYevpsbttCMYinwNpBX/BUGs-2022?node-id=201%3A2

###

### Environment information

Community and edge

**OpenProject version**

All versions

**Browser**

* [x] Chrome
* [x] Firefox
* [x] Safari
* [x] Mobile Safari
* [ ] Other (please specify)

**Language**

EnglishEnd of the insertion Begin of the deletion <figure class="image op-uc-figure"><div class="op-uc-figure--content"><img class="op-uc-image" src="/api/v3/attachments/21381/content"></div></figure>End of the deletion