As a user I want to create and see custom vocabulary, so I can learn words that are not part of provided modules. 

There should be an additional menu-icon in the footer for the custom vocabulary

• User Story 1: It should be possible to create own vocabulary. Mandatory: at least one image, article, word. Opional: Audiofile and alternative words
• User Story 2: It should be possible to view a list of the vocabulary with all details
• User Story 3: It should be possible to delete a word
• User Story 4: It should be possible to edit a word
• User Story 5: it should be possible to search for a word
• User Story 6: it should be possible to learn own vocabulary in long term memory exercise
• User Story 7: it should be possible to do all exercises for the own vocabulary, in blocks of 10 words.