Workflow translations + fixes for travis CI (reworked)

This PR enchances i18n for workflows. It enables translations for most widgets appearing on workflow search, workflow search result, workflow edition, and workflow history pages. Currently translated items include static labels/titles as well as action names rendered to jS grids and action buttons. Mapping actions' `short_name` to `I18N_OPENXPKI_WF_ACTION_XXXX` is delegated to separate perl module `OpenXPKI::Client::UI::Workflow::Translations`. That way we still have same *.xml workflow configs and same contens in DB but get translated strings on the UI.