[openstreetmap/openstreetmap-website] fix welcome message (#2537)

[Anton]

![WelcomeARABIC_long](https://user-images.githubusercontent.com/518939/74729407-1b2b3f80-524d-11ea-9d8a-fb63b315daf6.png)
![WelcomeARABIC](https://user-images.githubusercontent.com/518939/74729412-1c5c6c80-524d-11ea-86f4-7e2cfee73049.png)
![WelcomeEN_focus](https://user-images.githubusercontent.com/518939/74729415-1cf50300-524d-11ea-896c-6369bb7c8239.png)
![WelcomeEN](https://user-images.githubusercontent.com/518939/74729416-1cf50300-524d-11ea-99f7-7f1f8b7b416b.png)


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