FIXES PLT-6648 Add support for Server Side Encryption on S3 (#6467)

Help from Jason Blais on wording
Update storage_settings.jsx
Update en.json

model/config.go

@@ -262,6 +262,7 @@ type FileSettings struct {
 	AmazonS3Endpoint        string
 	AmazonS3SSL             *bool
 	AmazonS3SignV2          *bool
+	AmazonS3SSE             *bool
 }
 
 type EmailSettings struct {
@@ -551,6 +552,11 @@ func (o *Config) SetDefaults() {
 		// Signature v2 is not enabled by default.
 	}
 
+	if o.FileSettings.AmazonS3SSE == nil {
+		o.FileSettings.AmazonS3SSE = new(bool)
+		*o.FileSettings.AmazonS3SSE = false // Not Encrypted by default.
+	}
+
 	if o.FileSettings.EnableFileAttachments == nil {
 		o.FileSettings.EnableFileAttachments = new(bool)
 		*o.FileSettings.EnableFileAttachments = true