Revert "moving developer-only strings to api messages (#10188)"

This reverts commit a42cb0e3ab. Testing hypothesis that this was causing Staging to break.

website/server/controllers/api-v3/hall.js

@@ -5,7 +5,6 @@ import {
   NotFound,
 } from '../../libs/errors';
 import _ from 'lodash';
-import apiMessages from '../../libs/apiMessages';
 
 let api = {};
 
@@ -63,7 +62,7 @@ api.getPatrons = {
   url: '/hall/patrons',
   middlewares: [authWithHeaders()],
   async handler (req, res) {
-    req.checkQuery('page').optional().isInt({min: 0}, apiMessages('queryPageInteger'));
+    req.checkQuery('page', res.t('pageMustBeNumber')).optional().isNumeric();
 
     let validationErrors = req.validationErrors();
     if (validationErrors) throw validationErrors;