- Move the logic of getting the current translations to `ICurrentTranslations` utility
- Add `getCurrentTranslations` method to load current translations for multiple messages sets, template, languages and sides with a single SQL query
- Optionally, cache the current translations with `cacheCurrentTranslations` method and load them from cache by passing `use_cache=True` to `getCurrentTranslation`
- Use cache when calling `getCurrentTranslation` from `TranslationMessage.isHidden()`
- Cache current translations when in `CurrentTranslationMessageView` to avoid multiple SQL queries when calling `isHidden()` for multiple messages
Don't show rejected messages in the list of suggestions
If a there's a message from an external project that has been rejected
(a newer message is set as current), that message should not be displayed
in the list of external suggestions.
Non-rejected suggestions (created after the current message has been approved) are still displayed.
`database/schema/upgrade.py` used to support running outside a VCS
branch, in which case it would record the `branch_nick` and `revid`
columns of new `LaunchpadDatabaseRevision` columns as NULL. I
accidentally dropped this support when removing bzr support from this
script in commit 8651d7420e9254733234e84e84933c806521a4fc, but it's
still useful to have: in particular, Launchpad trees deployed via charms
don't currently have a `.git` directory, but it's handy to be able to
run `upgrade.py` from them anyway.
It doesn't make sense to set production database connection strings in
the configuration schema. Production deployments already override these
connection strings to something else in any case, and nothing else will
be able to connect to the production databases.
