removed duplicate translation

plugins/Referrers/Controller.php

plugins/Referrers/Reports/GetKeywords.php

plugins/Referrers/lang/am.json

plugins/Referrers/lang/ar.json

plugins/Referrers/lang/be.json

plugins/Referrers/lang/bg.json

plugins/Referrers/lang/ca.json

plugins/Referrers/lang/cs.json

plugins/Referrers/lang/da.json

plugins/Referrers/lang/de.json

plugins/Referrers/lang/el.json

plugins/Referrers/lang/en.json

plugins/Referrers/lang/es.json

plugins/Referrers/lang/et.json

plugins/Referrers/lang/eu.json

plugins/Referrers/lang/fa.json

plugins/Referrers/lang/fi.json

plugins/Referrers/lang/fr.json

plugins/Referrers/lang/gl.json

plugins/Referrers/lang/he.json