As an editor I want to see a consistent order in the grammatical features of a Form of a Lexeme in order to more easily compare different Forms.
**Problem:**
Currently the grammatical features of a Form are ordered by the Item ID and there not even numerical but string order (see GetGrammaticalFeatures()). This doesn't make much sense for the reader.
**Example:**
https://www.wikidata.org/wiki/Lexeme:L82714
**Screenshots/mockups:**
{F34107920}
**BDD**
GIVEN a Lexeme page with a Form
THEN the grammatical features are sorted in a consistent order every time
AND the list is configured on-wiki
**Acceptance criteria:**
* grammatical features on Forms of a Lexeme are always ordered based on a configured list
* the configuration of the order should happen via a page on-wiki similar to MediaWiki:Wikibase-SortedProperties
* If a grammatical feature is not in the configured list then we add it at the end of the grammatical features. If there are several we sort those by their Q-ID numerically.
* The order only affects the display on Lexeme pages, not the stored data
**Notes:**
* This order varies by language but we accept that we can only have one order for all languages for now.