Replace "move" icon with "zoom" icon

[Esshahn]

Recommendation: replace the "move" icon with a "zoom" (magnifying glass) icon, as zooming is the main feature and panning just a necessary subset.

[nurpax]

I tried zoom with magnifying glass but with font awesome the magnifying glass looks too much like "search" (it's even named search), to the point that it's imo quite confusing (looks like the button is for searching through documentation/help).

If you find an icon from here that you think would fit the bill, please suggest: https://fontawesome.com/v4.7.0/icons/

Maybe this: https://fontawesome.com/v4.7.0/icon/search-plus?

[nurpax]

Tagging for 0.8, probably won't make it for 0.7 unless someone suggests the exact fontawesome icon to use. Search (magnifying glass) icon is too confusing.