resolves #534, all ribbon labels information moved to text collection
resolves #526
Issue #526: point 4 resolved, need to be tested
resolves #524
#539 started
fixes #531, fixes #532, fixes #533 via resolves #539
resolves #507;
Issue #510: added a context menu in shapes lab and create setting dialog for shapes lab
.pptx was introduced in PowerPoint 2007.
Remove "(added previously)".
Rephrase AddAnimationButtonSupertip.
ZoomIn/ZoomOutButton: "Adds a slide with animations" -> "Creates an animation slide."
Comment pointing out typo in constant name.
Rephrase to remove mentions of user ("you").
Click on this button -> Click this button.
Rephase MoveCropShapeButtonSupertip.
Remove "on the fly."
Rephrase AddSpotlightButtonSupertip.
Rephrase ReloadSpotlightButtonSupertip.
Rephrase AddAudioButtonSupertip.
"and click this" -> "then click this"