IMAP language string for 'Port' is missing (Bug #1360050)

Add missing language string for IMAP Port field.

Change-Id: I9fccdd890bc186971fa1b7e90f965a7b34a25615
Signed-off-by: Ghada El-Zoghbi <ghada@catalyst-au.net>
Merge "IMAP language string for 'Port' is missing (Bug #1360050)"