In some instances, specifically when other systems are integrating with Zanata, the document id's provided are very difficult to make sense of for a human eye. While these are necessary fro the integration, it makes it difficult for the translators to find a document in Zanata.
There is a need to add an optional "display name" to documents which can be used in searches and in the Zanata UI to give it a more user friendly identifier. The display name doesn't need to be unique (unlike the doc id), and needs to be provided via the REST api. There is no pressing need to be able to change or set it in the web UI.