[openstreetmap-website] Strange + and - characters on zoom controls (#164)

[Martin Raifer]

The modified workaround introduced in 3d40181 doesn't seem to fix this properly (Opera, Chrome still render the +/- icons). This is because it doesn't really make sense to use `text-indent` with a percentage value when the containing element does have a width of 0 (see [specs](http://www.w3.org/TR/CSS21/text.html#indentation-prop)).

But, as we already know the width of the object in question, one could simply use that fixed value `text-indent: 26px`. Also, `white-space: nowrap` is not needed, when the text to hide doesn't contain any whitespace.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/164#issuecomment-10676392
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