1. Update 'gigabytes' to 'capacity' in the title
2. Add the blank before '(GiB)' and '(MiB)'
3. Update related i18n
Change-Id: I46de9793f9fb32a8f33915775bdfd5d486a84253
1. Fix size unit to GiB/MiB for
volume/snapshot/backup/image/flavor/monitor
2. Update i18n for Zun
Change-Id: I97bc881b438c9922a2123c36b7e8ea40e5307fd2