Bug 1784762: Need to typecast tag results when using another language

To test:
1) Site on latest master - using postgres
2) Have installed a lang pack
3) On homepage when logged out select language from dropdown
4) Login

before: errors
after: no errors

behatnotneeded

Change-Id: I2f61a9c319c98335749aa5e628e4a378c3cdc23e
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>