Hello everyone!

I'm translating some stuff related to music editing, and I found two things that brought me doubts.  First that it says  "...this shows the nudge pane, part of transport."  Transport of what?  Second, my translation returns an error about missing GUI tags but as far as I can see, all tags are there, so any suggestions?
Specifically, I'm translating this document:  https://fedora.zanata.org/project/view/musicians-guide?dswid=1960
 I attach a screenshot to show how it looks like the text, so maybe someone can figure out where is the problem.


Cheers & thanks,
Silvia