diff --git a/tryton/common/common.py b/tryton/common/common.py
index 0e0aeb33b6..6a57e652aa 100644
--- a/tryton/common/common.py
+++ b/tryton/common/common.py
@@ -822,7 +822,7 @@ def check_version(box, version=__version__):
         return True
     except Exception:
         logger.error(
-            _("Unable to check for new version"), exc_info=True)
+            _("Unable to check for new version."), exc_info=True)
         return True
     else:
         if check_version(box, version):
diff --git a/tryton/gui/window/dblogin.py b/tryton/gui/window/dblogin.py
index 3e9822ec44..fd030e6a3f 100644
--- a/tryton/gui/window/dblogin.py
+++ b/tryton/gui/window/dblogin.py
@@ -307,9 +307,9 @@ class DBListEditor(object):
 
         label = None
         if self.test_server_version(host, port) is False:
-            label = _('Incompatible version of the server')
+            label = _('Incompatible version of the server.')
         elif dbs is None:
-            label = _('Could not connect to the server')
+            label = _('Could not connect to the server.')
         if label:
             self.database_label.set_label('<b>%s</b>' % label)
             self.database_label.show()
@@ -623,11 +623,11 @@ class DBLogin(object):
             if not test:
                 if test is False:
                     common.warning('',
-                        _('Incompatible version of the server'),
+                        _('Incompatible version of the server.'),
                         parent=self.dialog)
                 else:
                     common.warning('',
-                        _('Could not connect to the server'),
+                        _('Could not connect to the server.'),
                         parent=self.dialog)
                 continue
             database = self.entry_database.get_text()
diff --git a/tryton/gui/window/view_form/screen/screen.py b/tryton/gui/window/view_form/screen/screen.py
index addfde0b32..50f43b3d2e 100644
--- a/tryton/gui/window/view_form/screen/screen.py
+++ b/tryton/gui/window/view_form/screen/screen.py
@@ -1059,18 +1059,18 @@ class Screen(SignalEvent):
     def invalid_message(self, record=None):
         if record is None:
             record = self.current_record
-        domain_string = _('"%s" is not valid according to its domain')
+        domain_string = _('"%s" is not valid according to its domain.')
         domain_parser = DomainParser(
             {n: f.attrs for n, f in record.group.fields.items()})
         fields = []
         for field, invalid in sorted(record.invalid_fields.items()):
             string = record.group.fields[field].attrs['string']
             if invalid == 'required' or invalid == [[field, '!=', None]]:
-                fields.append(_('"%s" is required') % string)
+                fields.append(_('"%s" is required.') % string)
             elif invalid == 'domain':
                 fields.append(domain_string % string)
             elif invalid == 'children':
-                fields.append(_('The values of "%s" are not valid') % string)
+                fields.append(_('The values of "%s" are not valid.') % string)
             else:
                 if domain_parser.stringable(invalid):
                     fields.append(domain_parser.string(invalid))