様々な修正 (#4859)

Typo, Redundant code, Syntax error の修正

src/client/app/common/views/pages/page/page.vue

@@ -47,7 +47,7 @@ class Script {
 
 	public interpolate(str: string) {
 		if (str == null) return null;
-		return str.replace(/\{(.+?)\}/g, match => {
+		return str.replace(/{(.+?)}/g, match => {
 			const v = this.vars[match.slice(1, -1).trim()];
 			return v == null ? 'NULL' : v.toString();
 		});