Value of Global parameter "custom.diskoffering.size.min" is not reflected in UI during new instance creation.

Added fields to /api and /server classes for CustomDiskOfferingMinSize
to be available in CapabilitiesResponse. Fixed UI code in Instance
Wizard to have this config value as the minimum selectable option when
we are in custom disk size mode.
Update Transifex config file (add 4.4 resources config)