Plus characters in photo album folders break stuff

[Jelmer van der Linde]

Apparently, if you try to add photos to a photo album, folder with + in them will appear in the folder browser, but once you click on them no thumbnails will be loaded in the list below it. Maybe it is an escaping issue somewhere?

[Jelmer van der Linde]

Escape folder name in add photo browser. This fixes #61.

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