FS#6553 - change text on viewport window
Maybe it is only me but it always confuses me this
'Copy to viewport' and 'Paste from viewport'
I tried to give a more descriptive text.
'Copy to viewport' was changed to 'Scroll to main' and
'Paste from viewport' to 'Scroll main window'
I do not think it is necessary to mention the viewport because the buttons are on the viewport.
See patch below.
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