Use GtkFileChooserNative

Merged Daniel Garcia Moreno requested to merge file-chooser-native into master

This patch uses the GtkFileChooserNative instead of the GtkFileChooser to open and save po files. This will improve the experience for flatpak because it will show bookmarks and the integration with the host system is better.

This change also introduces a small issue with file paths. The GtkFileChooserNative returns a path like /run/user/... for each file so it's not possible to know the real path of that file.

We were showing the full file path on the headerbar, but with this temp path that's not useful, so this patch removes that subtitle.

You can notice this problem also when clicking on "save as" because the default folder will be that temp path, instead the user folder.

Fix #116 (closed)

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