Fix context menu in ride editor (QT5 only)

... same problem as in 'Ride Navigator'  (only QT 5.3.1) (fixed on June
20th)
... tested both 4.8.6 and 5.3.1 now
...
https://github.com/GoldenCheetah/GoldenCheetah/commit/88e1dc5745462a752c78c3d8c9ff9cc5d0a393b6
Merge pull request #993 from Joern-R/pull4

Fix context menu in ride editor (QT5 problem only)
Fix Column Widths Nit

.. in ride navigator for new athlete
Merge pull request #994 from amtriathlon/master

Spanish translation update
Review of Science docs

.. better grammar and flow and also changed some of the
   text to better explain things like hydration and gels etc