When moving from the current translation to the list of translations, the user is exposed with the empty dashboard for a while. On slow connections, users may think that their work has not been saved. A loading indicator can help to communicate that the content has not been loaded yet.
Similarly, when moving from the list of translations to a specific translation in the editor, the source article is shown first making the translation look empty for a while. This can make users feel that the content they created is lost. In this case, a loading indicator can help too.
These issues may be magnified by the real data loss issues, but even with a more reliable saving system the loading indicators will help.