lims_email: results report name format: add sample_label as variable

lims_email/locale/es.po

@@ -121,11 +121,13 @@ msgid ""
 "Available variables (also in upper case):\n"
 "- ${number}\n"
 "- ${sample_number}\n"
+"- ${sample_label}\n"
 "- ${party_name}"
 msgstr ""
 "Variables disponibles (también en mayúsculas):\n"
 "- ${number}\n"
 "- ${sample_number}\n"
+"- ${sample_label}\n"
 "- ${party_name}"
 
 msgctxt "model:ir.action,name:act_results_report_format"

lims_email/results_report.py

@@ -299,6 +299,8 @@ class ResultsReport(metaclass=PoolMeta):
             'number': getattr(self, 'number', None) or '',
             'sample_number': (sample and
                 sample.notebook.fraction.sample.number or ''),
+            'sample_label': (sample and
+                sample.notebook.fraction.sample.label or ''),
             'party_name': sample and sample.party.rec_name or '',
             }
         for key, value in list(substitutions.items()):
@@ -801,6 +803,7 @@ class ReportNameFormat(ModelSQL, ModelView):
         help=("Available variables (also in upper case):"
             "\n- ${number}"
             "\n- ${sample_number}"
+            "\n- ${sample_label}"
             "\n- ${party_name}"))
 
     @classmethod