A11y: Buttons must have discernible text

Tested in 1.0.1-SNAPSHOT-62b6183
Description/aXe Error
Buttons must have discernible text
Issue Location
Metadata Provider Add/Edit Filters page: Selector arrows and trash icons
 
Rule Description
Buttons must have discernible text that clearly describes the destination, purpose, function, or action for screen reader users.
 
User Impact
Critical
Issue Type:

• WCAG 2.0 (A): MUST
• Section 508: MUST
• WCAG 2.1 (A): MUST
  WCAG Success Criteria:
• 4.1.2 Name, Role, Value
  Section 508 Guidelines:
• 1194.22 (a) Text equivalent for non-text elements
   
  Reference page
  https://dequeuniversity.com/rules/axe/3.0/button-name?application=AxeChrome
   
  Screenshot
  Discernible Text