As a Lexeme creator I want to be able to specify the Lemma of my Lexeme in order to define the word my new Lexeme describes.

Problem:
We need a text input for the Lemma of the new Lexeme.

Screenshots/mockups:
https://www.figma.com/file/XoYktoKEBnC0VIf1SRuxJK/Lexicographical-Data-UI?node-id=493%3A3179

BDD
GIVEN the special page to create a new Lexeme
WHEN loading the page
THEN an input field for the Lemma is available
AND a placeholder is shown in the input field

Acceptance criteria:

• special page exists with an input field for the Lemma
• placeholder text is shown inside the input field when nothing is typed in it

Notes:

• Placeholder text: Short form of a word such as in a dictionary entry, e.g., ‘first’
• Length limit: 1000 Unicode code points according to current code
• Component: Wikit text input
• Errors: length limit is reached (checked on submit later)