Clarify selection-scope Open actions
Ark currently has two "Open" actions: one is global-scope (open a new archive file) while the other is selection-scope (open the selected file in an external program). They both have identical text and icons, and are disambiguated only by their tooltips and locations in the menu structure. However this does not help when the action is added to the toolbar, as it is by default. In this circumstance, its purpose is very unclear as it has the same name and icon as a typical "Open a new file" action, but it doesn't open a new file.
To clarify the situation, this commit makes the following changes to the selection-scope open actions:
- Use longer text that explains what the action will do, and delete the special tooltip text
- Use the document-export icon, which uses the more appropriate visual metaphor of "get the document out of this app".
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