Label buttons that only have icons for markup

ui/app/templates/components/stepper-input.hbs

@@ -12,6 +12,7 @@
 <button
   data-test-stepper-decrement
   role="button"
+  aria-label="decrement"
   class="stepper-input-stepper button {{class}}"
   disabled={{or disabled (lte internalValue min)}}
   onclick={{action "decrement"}}>
@@ -20,6 +21,7 @@
 <button
   data-test-stepper-increment
   role="button"
+  aria-label="increment"
   class="stepper-input-stepper button {{class}}"
   disabled={{or disabled (gte internalValue max)}}
   onclick={{action "increment"}}>

ui/app/templates/components/task-group-row.hbs

@@ -13,6 +13,7 @@
       <button
         data-test-scale="decrement"
         role="button"
+        aria-label="decrement"
         class="button is-xsmall is-light"
         disabled={{or isMinimum runningDeployment (cannot "scale job")}}
         onclick={{action "countDown"}}>
@@ -21,6 +22,7 @@
       <button
         data-test-scale="increment"
         role="button"
+        aria-label="increment"
         class="button is-xsmall is-light"
         disabled={{or isMaximum runningDeployment (cannot "scale job")}}
         onclick={{action "countUp"}}>