[web] safety belt to avoid overriding pageid with loadxhtml() HtmlHeaders.define_var() now accepts a third optional 'override' paramater. If set to False, the variable won't be evaluated if it's already defined in the page.

msgid "read_perm"
msgstr ""

msgid "add_perm"
msgstr ""

msgid "update_perm"
msgstr ""

msgid "delete_perm"
msgstr ""