Merge pull request #447 from 4teamwork/lg-change-german-wording-for-unchecked

Wrong label for: „Nicht geprüft“
Harmonize translation defaults, to avoid i18ndude warnings.
Fixed translation for filing_number column in dossier listings.
Merge pull request #490 from 4teamwork/pg_filing_nubmer_translations

Fix translations for filing number column in dossier listings.
Don't encode attached mails when sending documents as email.