[FIX] account: incorrect use of translation system

Cf https://www.odoo.com/documentation/11.0/reference/guidelines.html#use-translation-method-correctly

addons/account/i18n/account.pot

@@ -67,7 +67,13 @@ msgstr ""
 #. module: account
 #: code:addons/account/models/account_move.py:382
 #, python-format
-msgid "%sreversal of: "
+msgid "Reversal of: %s"
+msgstr ""
+
+#. module: account
+#: code:addons/account/models/account_move.py:382
+#, python-format
+msgid "Automatic reversal of: %s"
 msgstr ""
 
 #. module: account
@@ -1708,12 +1714,6 @@ msgstr ""
 msgid "Automated Entries"
 msgstr ""
 
-#. module: account
-#: code:addons/account/models/account_move.py:382
-#, python-format
-msgid "Automatic "
-msgstr ""
-
 #. module: account
 #: code:addons/account/models/company.py:394
 #, python-format

addons/account/models/account_move.py

@@ -379,7 +379,7 @@ class AccountMove(models.Model):
         reversed_move = self.copy(default={
             'date': date,
             'journal_id': journal_id.id if journal_id else self.journal_id.id,
-            'ref': _('%sreversal of: ') % (_('Automatic ') if auto else '') + self.name,
+            'ref': (_('Automatic reversal of: %s') if auto else _('Reversal of: %s')) % (self.name),
             'auto_reverse': False})
         for acm_line in reversed_move.line_ids.with_context(check_move_validity=False):
             acm_line.write({