add closing tags

build/lib/i18n.js

@@ -119,6 +119,7 @@ class XLF {
             for (const item of items) {
                 this.addStringItem(file, item);
             }
+            this.appendNewLine('</body></file>');
         }
         this.appendFooter();
         return this.buffer.join('\r\n');

build/lib/i18n.ts

@@ -203,6 +203,7 @@ export class XLF {
 			for (const item of items) {
 				this.addStringItem(file, item);
 			}
+			this.appendNewLine('</body></file>');
 		}
 		this.appendFooter();
 		return this.buffer.join('\r\n');