One customer recently upgraded to 19.05.04.000 (Debian packages). After the upgrade the serials module is broken when they view the Swedish translation, but not when they view it in English. The most visually striking problem is that both page 1 and 2 of the serials form is displayed on one page. 

I have narrowed the problem down to koha-tmpl/intranet-tmpl/prog/sv-SE/modules/serials/subscription-add.tt line 509 which looks like this in the Swedish translation:

  var mana_enabled = [% IF (Koha.Preference('Mana') == 1 && mana_url) %]1[% ELSE %][% END %];

and this in the English original:

  var mana_enabled = [% IF (Koha.Preference('Mana') == 1 && mana_url) %]1[% ELSE %]0[% END %];

Notice the missing 0 between ELSE and END in the Swedish template. 

I have tried to look through the Swedish staff .po file, but I have not been able to spot any strings that affect this area of the file.