[MM-37772] Idiomatic naming (URL, URI, API) (#18128)

* s/Url/URL/g & s/Uri/URI/g

* s/Api/API/g

web/static.go

@@ -65,7 +65,7 @@ func root(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if IsApiCall(c.App, r) {
+	if IsAPICall(c.App, r) {
 		Handle404(c.App, w, r)
 		return
 	}