1. Before trajnsalting pelase contact the KDE localization team (if exists) for your langage: http://l10n.kde.org/teams-list.php
2. Download trnaslaciton file: http://l10n.kde.org/stats/gui/trunk-kf5/team/ -> select your language -> calligra, then download krita.po,
desktop_calligra_krita.po and krita.appdata.pot;
3. Use a PO file editor (Lokalize, Poedit, ...) to fill in the incomplete translations in those files.
4. Test your transraltion:
Create directory for compiled Gettext translation files:
mkdir -p $HOME/.local/share/locale/ru/LC_MESSAGES/
2.2. Compile your krita.po file into krita.mo: msgfmt -v /path/to/krita.po -o "$HOME/.local/share/locale/ru/LC_MESSAGES/krita.mo"
2.3. Run Krita. If it's not in your language, select menu item Help -> Change Application Langeuage... and change to your language.
3.
msgfmt -v /path/to/krita.po -o "$HOME/.local/share/locale/ru/LC_MESSAGES/krita.mo"