message keys to unknown language translation catalogue (4 entries)

key: doi.displayName
target: DOI

key: doi.readerDisplayName
target: DOI

key: doi.manager.settings.description
target: Sukonfiguruokite DOI skiep, kad galtumte valdyti ir naudoti DOI sistemoje:

key: doi.manager.settings.doiPrefix
target: DOI priedlis
