[openstreetmap/openstreetmap-website] same icon for each item on wlcome page with persian locale (#2156)

[Iman]

Welcome page shows a single icon for every item (maybe when it's rtl).

english:

![20190220_193823](https://user-images.githubusercontent.com/8467903/53350186-84b48e80-3916-11e9-9bd3-d7ab0190768e.jpg)

persian:
![20190220_193512](https://user-images.githubusercontent.com/8467903/53350224-96963180-3916-11e9-9c8a-6a956f6106f8.jpg)


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