addeed phrase Admin 2 columns with left bar in translate file

Author: AnshuMishra17

app/code/Magento/Theme/i18n/en_US.csv

@@ -148,6 +148,7 @@ Configuration,Configuration
 "Rebuild design config grid index","Rebuild design config grid index"
 "Admin empty","Admin empty"
 "Admin 1column","Admin 1column"
+"Admin 2 columns with left bar","Admin 2 columns with left bar"
 "Theme Information","Theme Information"
 "Other Settings","Other Settings"
 "HTML Head","HTML Head"