Allow translation with numerical token replacement

Just escapes the special regex characters when creating a new RegExp so
that numerical keys can be used (e.g. my use case of replacing an
arbitrary number of tokens from an array). Otherwise it is interpreted
as a repetition.

modules/util/locale.js

@@ -45,7 +45,7 @@ export function t(s, o, loc) {
     if (rep !== undefined) {
         if (o) {
             for (var k in o) {
-                var variable = '{' + k + '}';
+                var variable = '\\{' + k + '\\}';
                 var re = new RegExp(variable, 'g'); // check globally for variables
                 rep = rep.replace(re, o[k]);
             }
@@ -124,4 +124,4 @@ export function languageName(context, code, options) {
         }
     }
     return code; // if not found, use the code
-}
+}