[FIX] Balances, My orders: Secondary action style

As suggested by @rippletravis.
[TASK] Net worth widget: real space before currency
[FIX] Balance overview tab: Fix sm breakpoints

As suggested by @rippletravis.
[FIX] Net worth widget: No wrap for amount + currency

Ensure that the green amount, its fraction and currency suffix fit into
one line, so the currency will never wrap below the amount. This would
happen for large amounts and large currencies, like "XAU (-0.5% pa)".

The new rpAutoZoom directive will shrink the CSS zoom until the text
fits into the line.