App Icons too small

In v3 which uses bootstrap v4, the font size has incresed, but the app icons have not. This causes them to look too small compared to the text which may appear next to them

![image](https://user-images.githubusercontent.com/664714/32458349-25dc0f48-c2fa-11e7-8c1d-c469dcde15c2.png)
vs
![image](https://user-images.githubusercontent.com/664714/32453193-9d7f25be-c2e9-11e7-855d-76764408e735.png)
