Update i18n translation for BigSwitch plugin log msg's

All the log messages now have the required hints. In addition to this
debug messages are not translated.

This is done for the plugins/bigswitch and plugins/common directories

Change-Id: If661fcfac3b22c8cffee65c3e8073e746ef3468e
Merge "Update i18n translation for BigSwitch plugin log msg's"