Hi Adi,

Thanks for submitting this change.  The work looks really good.

Please fix the small items below and then I'll (try) to land it for you, if ec2 will let me.  :(




> === modified file 'lib/lp/registry/interfaces/distroseries.py'
> --- lib/lp/registry/interfaces/distroseries.py	2010-04-08 18:40:18 +0000
+++ lib/lp/registry/interfaces/distroseries.py	2010-04-21 22:30:59 +0000
> @@ -250,33 +250,33 @@
>      language_pack_base = Choice(
>          title=_('Language pack base'), required=False,
>          description=_('''
> -            Language pack export with the export of all translations available
> -            for this `IDistroSeries` when it was generated. Next delta exports
> -            will be generated based on this one.
> +            Language pack with the export of all translations
> +            available for this distribution series when it was generated. The
> +            subsequent update exports will be generated based on this one.
>              '''), vocabulary='FilteredFullLanguagePack')
>  
>      language_pack_delta = Choice(
> -        title=_('Language pack delta'), required=False,
> +        title=_('Language pack update'), required=False,
>          description=_('''
> -            Language pack export with the export of all translation updates
> -            available for this `IDistroSeries` since language_pack_base was
> -            generated.
> +            Language pack with the export of all translation updates
> +            available for this distribution series since the language pack
> +            base was generated.
>              '''), vocabulary='FilteredDeltaLanguagePack')
>  
>      language_pack_proposed = Choice(
>          title=_('Proposed language pack update'), required=False,
>          description=_('''
> -            Base or delta language pack export that is being tested and
> -            proposed to be used as the new language_pack_base or
> -            language_pack_delta for this `IDistroSeries`.
> +            Base or update language pack export that is being tested and
> +            proposed to be used as the new language pack base or
> +            language pack update for this distribution series.
>              '''), vocabulary='FilteredLanguagePack')
>  
>      language_pack_full_export_requested = Bool(
>          title=_('Request a full language pack export'), required=True,
>          description=_('''
>              Whether next language pack generation will be a full export. This
> -            is useful when delta packages are too big and want to merge all
> -            those changes in the base package.
> +            is useful when update packs are too big and want to merge all
> +            those changes in the base pack.

s/This is/This information is/

>              '''))
>  
>      last_full_language_pack_exported = Object(

> === modified file 'lib/lp/translations/browser/distroseries.py'
> --- lib/lp/translations/browser/distroseries.py	2010-02-24 18:33:18 +0000
> +++ lib/lp/translations/browser/distroseries.py	2010-04-21 22:30:59 +0000
> @@ -122,6 +122,28 @@
>  
>          return unused_language_packs
>  
> +    @property
> +    def have_latest_full_pack(self):

Please add a docstring here.

> +        current = self.context.language_pack_base
> +        latest = self.context.last_full_language_pack_exported
> +        if (current is None or
> +            latest is None or
> +            current.file.http_url == latest.file.http_url):
> +            return False
> +        else:
> +            return True
> +
> +    @property
> +    def have_latest_delta_pack(self):

And here.

> +        current = self.context.language_pack_delta
> +        latest = self.context.last_delta_language_pack_exported
> +        if (current is None or
> +            latest is None or
> +            current.file.http_url == latest.file.http_url):
> +            return False
> +        else:
> +            return True
> +
>      def _request_full_export(self):
>          if (self.old_request_value !=
>              self.context.language_pack_full_export_requested):

> === modified file 'lib/lp/translations/templates/distroseries-language-packs.pt'
> --- lib/lp/translations/templates/distroseries-language-packs.pt	2009-09-17 11:10:49 +0000
> +++ lib/lp/translations/templates/distroseries-language-packs.pt	2010-04-21 22:30:59 +0000