As part of POFile:+translate page rework, we should create a new POFileBaseView which:
* Provides access to generic POFile information, like plurals, contributors and related pofiles ("related" are those which are sharing translations, or from linked source packages/products); related pofiles is lower priority right now, so should be filed as a separate bug
* Deals with filtering (translated, untranslated, changed-in-lp, new-suggestions filters), batching and searching: basically, getting relevant TranslatableMessages instead of POTMsgSets (some of this will probably have to be moved to POFile model implementation, to replace getPOTMsgSet* methods in the future)
* Ideally, it would not use TranslatableMessageViews, but adapted TranslatableMessage which provides needed information (which would be used in TranslatableMessageView as well) because TranslatableMessageView is distinct from POFile*Views, and TranslatableMessageView might be constructing too much stuff.
This view will be the basis for future POFileTranslateView, POFileReviewView and POFileView.
Fixed in devel 9392.