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[Akihiro Motoki <1583757@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Django templates support 'trimmed' option [1]. remove newline characters
from the beginning and the end of the content of the {% blocktrans %}
tag, replace any whitespace at the beginning and end of a line and merge
all lines into one using a space character to separate them.

Without 'trimmed' option, translators will get source strings with
meaningless newlines and whitespaces like below. Zanata (translation
check site) checks the number of newlines, so translators need to insert
newlines to silent Zanata validations. It is really annoying and
meaningless.

  #: openstack_dashboard/dashboards/admin/volumes/templates/volumes/snapshots/_update_status.html:10
  msgid ""
  "\n"
  "    The status of a volume snapshot is normally managed automatically.  "
  "In some circumstances\n"
  "    an administrator may need to explicitly update the status value. This"
  " is equivalent to\n"
  "    the <tt>cinder snapshot-reset-state</tt> command.\n"
  "    "
  msgstr ""

By using 'trimmed' option in Django templates, we can get rid of meaningless newlines in extracted message strings.
The recent released version of django-bebal supports 'trimmed' option [2] and now we can move the situation forward.

[1] https://docs.djangoproject.com/ja/1.9/topics/i18n/translation/#blocktrans-template-tag
[2] https://github.com/python-babel/django-babel/commit/88b389381c0e269605311ae07029555b65a86bc5

** Affects: horizon
     Importance: Medium
     Assignee: Akihiro Motoki (amotoki)
         Status: New


** Tags: i18n

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https://bugs.launchpad.net/bugs/1583757

Title:
  multiline blocktrans in django templates should use 'trimmed' option

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  Django templates support 'trimmed' option [1]. remove newline
  characters from the beginning and the end of the content of the {%
  blocktrans %} tag, replace any whitespace at the beginning and end of
  a line and merge all lines into one using a space character to
  separate them.

  Without 'trimmed' option, translators will get source strings with
  meaningless newlines and whitespaces like below. Zanata (translation
  check site) checks the number of newlines, so translators need to
  insert newlines to silent Zanata validations. It is really annoying
  and meaningless.

    #: openstack_dashboard/dashboards/admin/volumes/templates/volumes/snapshots/_update_status.html:10
    msgid ""
    "\n"
    "    The status of a volume snapshot is normally managed automatically.  "
    "In some circumstances\n"
    "    an administrator may need to explicitly update the status value. This"
    " is equivalent to\n"
    "    the <tt>cinder snapshot-reset-state</tt> command.\n"
    "    "
    msgstr ""

  By using 'trimmed' option in Django templates, we can get rid of meaningless newlines in extracted message strings.
  The recent released version of django-bebal supports 'trimmed' option [2] and now we can move the situation forward.

  [1] https://docs.djangoproject.com/ja/1.9/topics/i18n/translation/#blocktrans-template-tag
  [2] https://github.com/python-babel/django-babel/commit/88b389381c0e269605311ae07029555b65a86bc5

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