Builing up export options meta in wp controller.
Using labels for export formats like in style guide.
Export xls with description label and moved export icon in menu.
Add styles to export options

- added styles to export options
- added export icon to the action-menu in the toolbar
Locales for export options.
Merge pull request #1466 from opf/feature/export-modal-options-8229

Feature/export modal options 8229