Implemented EZP-15040: Support for more than 30 languages

Issue: https://jira.ez.no/browse/EZP-15040

Support for more than 30 (up to 62) languages thanks to the **bigint** SQL datatype.

To be reviewed together with: https://github.com/ezsystems/ezpublish-kernel/pull/493

Thank you @glye for the initial patch!