Application names i18n in the admin app broken

[Ramiro Morales]

Having

{% blocktrans with app.name as name %}{{ name }}{% endblocktrans %}

as we currently do in some admin templates shows a decision has been made to allow developers the ability translate application names.

Problem is this feature was DOA (r3270, django/contrib/admin/templates/admin/index.html, similar template code was copied since then to another file: r8474, app_index.html)

See relevant ​django-users and ​django-i18n threads for the details.

The attached patch implements as a fix the awkward manual steps needed to workaround this bug outlined by the user patrikk in the first thread, plus the following enhancements:

• index, app_index: Moved the markup-as-translatable of app names from the template to the view code so the translators aren't forced to translate a second title()'d version of every app name.
• Consistent use of the capfirst filter on the app names in the breadcrumbs of the different views.
• Don't touch base_site.html in order to provide for translatability of the app name in the <title> HTML tag for the application-specific model list view. Instead, implement the needed change in the relevant view (app_index) (replacing a "%s administration" msgid with a more translator-friendly "%(app_label)s administration" one in the process). This will spare translators the need to translate both a "<appname>" and a "<appname> administration" literals.
• Extend above fixes to other templates that also need them (delete_confirm.html, object_history.html)

Notes to reviewers:

Note 1: This patch has nothing to do with the decision of how we will allow the app name metadata to be specified and marked as translatable in the app itself, that seems to be a new feature I'm sure is being dealt with in other tickets. This ticket is much less ambitious: it's about fixing an old internationalization bug in the presentation of that information (irrespective of its origin in the backend) in the admin contrib app.

Note 2: The change_form.html template ran the app label through the escape filter. This has been dropped because it seems inconsistent with what is done in rest of the templates, the app name isn't end user-provided content so the risk of being abused for XSS seems low.

Note 3: There seems to be some inconsistency on how the app name is a) .title()'d for the name that appear in the caption of model tables (index and app_index views) and b) |capfirst'd for use in HTML title and breadcrumbs. This has been left untouched to avoid introducing a backward incompatible change.

Note 4: A further enhancement would be to move presentation-related munging (like calling .title() and/or capfirst() in view code) from views to templates if/when #5972 gets committed but meanwhile this fix can solve this bug now with the tools we have at hand now.

Several of the problems exposed above had already been reported in #9273.

[Ramiro Morales]

(made description more clear)

[Ramiro Morales]

Patch updated to trunk post-bulk-edit and post-r10234

[Ramiro Morales]

Updated patch also extends fixes to two recently added templates: delete_selected_confirmation.html (added in r10121) and change_password.html (added in r10234)

[Ramiro Morales]

Patch with some fixes to the patch iself

[Ramiro Morales]

Patch updated to trunk as of r11581

[Ramiro Morales]

Updated ticket description.