[Merge] lp:~vrruiz/camera-app/i18n-strings into lp:camera-app

[Florian Boucault]

Review: Needs Fixing

Also:
- commented code should be removed (e.g.: // label: i18n.tr("On"))
- a FIXME with an explanation of why the workaround is needed is important
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https://code.launchpad.net/~vrruiz/camera-app/i18n-strings/+merge/231873
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