DB Integrity checker should check localised text data tables for dependencies

[GreenyRepublic]

At the moment the DB integrity checker throws a lot of false positives for fields that point to keys for localised data. For example in building_culture_variants in Rome 2 - the 'description', 'short description', and 'flavour' fields all point to localised text data tables under text/db/, the keys are all present but the checker still throws an integrity error.

[Frodo45127]

Coming soon. The data needed to know what columns are false positives is already there. Just need wiring it up,