Add partial translations: bg, ca, cs, hi, hr, sq, sr

.tx/config

apps/desktopgui/locale/messages_sr.po

apps/i2ptunnel/locale/messages_sq.po

apps/routerconsole/locale-countries/messages_bg.po

apps/routerconsole/locale-countries/messages_cs.po

apps/routerconsole/locale-countries/messages_hi.po

apps/routerconsole/locale-countries/messages_sr.po

apps/susimail/locale/messages_bg.po

apps/susimail/locale/messages_ca.po

apps/susimail/locale/messages_hr.po

apps/susimail/locale/messages_sr.po