Narrative:
As an editor of Wikidata-Lexeme I want to be able to add a new Sense and save it in a Lexeme in order to describe the different meanings of a word.

Acceptance Criteria:

• I can add a new Sense to a Lexeme
• The Sense gets a stable, non-reusable ID
• The Sense always has at least one Gloss
• The Sense is persistently stored/survives a page reload

Given: I am on a Lexeme page
When: I click "add Sense"
Then: I get an input field for a new gloss and a language code and provide those
Then: I click save
Then: the new Sense is added with a new ID in the pattern L123-S1

Personas to take into account:
Niels - Active editor on Wikidata
Alex - Data user in small startup