Mark wagtailforms-date-filter-placeholder for translation

CHANGELOG.txt

@@ -6,6 +6,7 @@ Changelog
 
  * Use minified versions of jQuery and jQuery UI in the admin. Total savings without compression 371 KB (Tom Dyson)
  * Hooks can now specify the order in which they are run (Gagaro)
+ * Fix: Marked 'Date from' / 'Date to' strings in wagtailforms for translation (Vorlif)
 
 
 1.9 (xx.xx.xxxx) - IN DEVELOPMENT

CONTRIBUTORS.rst

@@ -210,6 +210,7 @@ Contributors
 * Martey Dodoo
 * David Ray
 * Alasdair Nicol
+* Vorlif
 
 Translators
 ===========

docs/releases/1.10.rst

@@ -20,6 +20,8 @@ Other features
 Bug fixes
 ~~~~~~~~~
 
+ * Marked 'Date from' / 'Date to' strings in wagtailforms for translation (Vorlif)
+
 
 Upgrade considerations
 ======================

wagtail/wagtailforms/forms.py

@@ -112,11 +112,11 @@ class FormBuilder(object):
 class SelectDateForm(django.forms.Form):
     date_from = django.forms.DateTimeField(
         required=False,
-        widget=django.forms.DateInput(attrs={'placeholder': 'Date from'})
+        widget=django.forms.DateInput(attrs={'placeholder': _('Date from')})
     )
     date_to = django.forms.DateTimeField(
         required=False,
-        widget=django.forms.DateInput(attrs={'placeholder': 'Date to'})
+        widget=django.forms.DateInput(attrs={'placeholder': _('Date to')})
     )