Added missing translation strings to the file.

Author: yogeshsuhagiya

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

@@ -405,6 +405,8 @@ Web,Web
 "Url Options","Url Options"
 "Add Store Code to Urls","Add Store Code to Urls"
 "<strong style=""color:red"">Warning!</strong> When using Store Code in URLs, in some cases system may not work properly if URLs without Store Codes are specified in the third-party services (e.g. PayPal etc.).","<strong style=""color:red"">Warning!</strong> When using Store Code in URLs, in some cases system may not work properly if URLs without Store Codes are specified in the third-party services (e.g. PayPal etc.)."
+"Enable Frontend Resize","Enable Frontend Resize"
+"Resize performed via javascript before file upload.","Resize performed via javascript before file upload."
 "Auto-redirect to Base URL","Auto-redirect to Base URL"
 "Search Engine Optimization","Search Engine Optimization"
 "Use Web Server Rewrites","Use Web Server Rewrites"