[I18N] portal: make 'Accept & Sign' translatable

Move inside a node so the term can be exported (t-esc value are not
translatable)
opw-2031550

closes odoo/odoo#34663

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

addons/portal/i18n/portal.pot

@@ -153,6 +153,13 @@ msgid "<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" style=\"padding-t
 "            "
 msgstr ""
 
+#. module: portal
+#. openerp-web
+#: code:addons/portal/static/src/xml/portal_signature.xml:19
+#, python-format
+msgid "Accept & Sign"
+msgstr ""
+
 #. module: portal
 #: model:ir.model.fields,field_description:portal.field_portal_mixin__access_warning
 #: model:ir.model.fields,field_description:portal.field_portal_share__access_warning

addons/portal/static/src/xml/portal_signature.xml

@@ -16,7 +16,8 @@
                 <div id="o_portal_signature" class="card-body" style="padding: 0"/>
             </div>
             <div class="mt16 clearfix">
-              <button type="submit" class="btn btn-primary o_portal_sign_submit float-right"><t t-esc="widget.options.signLabel or 'Accept &amp; Sign'"/></button>
+              <t t-set='defaultSignLabel'>Accept &amp; Sign</t>
+              <button type="submit" class="btn btn-primary o_portal_sign_submit float-right"><t t-esc="widget.options.signLabel or defaultSignLabel"/></button>
             </div>
         </form>
     </t>