Minor changes to edit plot page

[sacrevert]

1. Change "Compass direction" to "Compass direction/aspect (if applicable)"
2. Change "Plot shape" to "Plot shape (if applicable)"
3. Change "Slope (degrees)" to "Slope in degrees (if applicable)"
4. Change "Dimensions – Length:" to "Dimensions – Length (if applicable)"
5. Change "Dimensions – Width:" to "Dimensions – Width (if applicable)"
6. Change "Elevation (m):" to "Elevation in metres (if applicable)"

[andrewvanbreda]

@sacrevert Done. I also added an N/A option to the shape as discussed.

[andrewvanbreda]

Close if happy