Adding Numeric control support for Backform.

This patch also includes an issue related to IntegerControl, which does
not emit any error message, when it has some issues.

In order to fix the issue, it will trigger 'pgadmin-session:invalid'
event, when the input value is not an valid integer.

web/pgadmin/browser/templates/browser/js/browser.js

@@ -634,6 +634,7 @@ function(require, $, _, S, Bootstrap, pgAdmin, alertify, CodeMirror) {
       'SQL_TAB': '{{ _('SQL') }}',
       'SQL_NO_CHANGE': '\n -- ' + '{{ _('Nothing changed') }}',
       'MUST_BE_INT' : " {{ _("'%%s' must be an integer.") }}",
+      'MUST_BE_NUM' : " {{ _("'%%s' must be a numeric.") }}",
       'MUST_GR_EQ' : " {{ _("'%%s' must be greater than or equals to %%d.") }}",
       'MUST_LESS_EQ' : " {{ _("'%%s' must be less than or equals to %%d.") }}"
     }