Bug fixes

• Language Select box cut off on checkout (#5210) @dstrukt
• POS Cart view malformed when special characters are in items (#5203 #5211) @Kukks
• Errors creating invoice from public form were not shown in the UI (#5208 #5211) @Kukks
• Cart view doesn't show item when the amount field is custom (#5204 #5211) @Kukks
• Can't save the item when adding a new category in POS (#5205 #5211) @Kukks