Japanese language setting should work

Current Situation
If you set

_sos_lang            = 'ja';

in ./config/operations_gui/custom.js then it has no effect. The japanese language file ./operations_gui/scheduler_lang_ja.js is corrupt.

Desired Behavior
JOC should change to japanese if

_sos_lang            = 'ja';

is configured in ./config/operations_gui/custom.js.

Workaround
Use attached language file and copy it to ./operations_gui/scheduler_lang_ja.js.