Merge pull request #551 from amtriathlon/1fedaf4e7233af54c5441f77cb46744581cc36f1

Enabled ScatterPlot axis legend translation
RidePlot: Correct min value for altitudes less than zero
fixes #527
Fix issue #553: take metricDetail->fillCurve from the checkbox state
rather than using the pointer.
Merge pull request #554 from cleeland/master

fix issue #553
Enabled translation of Search and Group By
Update spanish translation
Update italian translation (by Marco Piccirilli)
Merge branch 'master' of https://github.com/GoldenCheetah/GoldenCheetah