Wikimedia Bugzilla is closed!

Folow line is from  jquery.tablesorter.js  function cacheRegexs() currency: 
Line 465:   new RegExp( /^[£$€?.]/)

The ? and . is not a currency character. Use RegExp( /^[£$€¥¢]/) instead or RegExp( /^[\u00a2\u00a3$\u20ac\u00a4\u00a5]/) for [cents pound dollar euro yen currency].

For enhancement leave the ^ so that RegExp( /[£$€¥¢]/) or RegExp( /[\u00a2\u00a3$\u20ac\u00a4\u00a5]/) find the currency character also at end. In many languages, so in German, is the currency character at end: 10,50 €

In German Wikipedia the bug produces a unsortable column. If the year not set in template {{dts|20|07|}} a sortkey "?-07-2020. Juli" is used and sorting to currency gives in all rows 0 at digit-sortkey - this is unsortable. (see: [[w:de:Vorlage_Diskussion:Dts#Vorlage_ohne_Jahr_nutzlos]] )

here is table to test it:
{| class="wikitable sortable" 
! dts !! key !! 3 !! 4
|- 
|{{dts|19|8|}}
| ?-08-19
| $ 15.00
| 15.00 €
|-
|{{dts|28|07|}}
| ?-07-28
| $ 10
| 10 €
|- 
|{{dts|23|7|}}
| ?-07-23
| $3.50
| 3.50€
|}