[Layouts] Rename "Add item" and "Items" menus

[qgib]

Author Name: Harrissou Santanna (@DelazJ)
Original Redmine Issue: 17797
Affected QGIS version: master
Redmine category:map_composer/printing

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It looks weird to me to have a main menu in the Layout dialog named "Add item". Actually, it's what is under the "Items" menu that bugs me.

What about:

• "Add Item" is renamed into "Items", propviding means to add any type of item
• "Items" is renamed into someting like "(Re)Organize" (my preference goes here!), "Workplace", Rendering (?), .... because it provides tools to reshape how items will be placed and interact

[qgib]

Author Name: Giovanni Manghi (@gioman)

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Please check if this issue is still valid on QGIS 3.4.5 or 3.6.

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• status_id was changed from Open to Feedback

[nyalldawson]

@DelazJ How about we rename the "Add Item" menu to "Create"?