Allow custom text for abort - just like the ok (proceed button)

src/main/java/org/jenkinsci/plugins/workflow/support/steps/input/InputStep.java

@@ -104,6 +104,20 @@ private String capitalize(String id) {
         return id;
     }
 
+    /**
+     * Caption of the Abort button.
+     */
+
+    private String abort;
+
+    public String getAbort() {
+        return abort!=null ? abort : Messages.abort();
+    }
+
+    @DataBoundSetter public void setAbort(String abort) {
+        this.abort = Util.fixEmptyAndTrim(abort);
+    }
+
     /**
      * Caption of the OK button.
      */

src/main/java/org/jenkinsci/plugins/workflow/support/steps/input/InputStepExecution.java

@@ -86,7 +86,7 @@ public boolean start() throws Exception {
             String thisUrl = baseUrl + Util.rawEncode(getId()) + '/';
             listener.getLogger().printf("%s%n%s or %s%n", input.getMessage(),
                     POSTHyperlinkNote.encodeTo(thisUrl + "proceedEmpty", input.getOk()),
-                    POSTHyperlinkNote.encodeTo(thisUrl + "abort", "Abort"));
+                    POSTHyperlinkNote.encodeTo(thisUrl + "abort", input.getAbort()));
         } else {
             // TODO listener.hyperlink(…) does not work; why?
             // TODO would be even cooler to embed the parameter form right in the build log (hiding it after submission)

src/main/resources/org/jenkinsci/plugins/workflow/support/steps/input/InputStep/config.jelly

@@ -35,6 +35,9 @@ THE SOFTWARE.
         <f:entry field="ok" title="${%OK Button Caption}">
             <f:textbox/>
         </f:entry>
+        <f:entry field="abort" title="${%Abort Button Caption}">
+            <f:textbox/>
+        </f:entry>
         <f:entry field="submitter" title="${%Allowed Submitter}">
             <f:textbox/>
         </f:entry>

src/main/resources/org/jenkinsci/plugins/workflow/support/steps/input/InputStep/help-abort.html

@@ -0,0 +1,11 @@
+<p>Similar to the ok Proceed button, the Abort can be customised too.</p>
+
+<p>
+  Usage: <code>input message: 'Do you approve?' ok: "Yes" abort: "No"</code>
+</p>
+
+<p>Which will look like:</p>
+<pre>
+    Do you approve?
+    Yes or No
+</pre>

src/main/resources/org/jenkinsci/plugins/workflow/support/steps/input/InputStep/help-ok.html

@@ -0,0 +1,14 @@
+<p>
+  You can customize the text for the proceed button to better match the context
+  of the prompt you're asking your users about.
+</p>
+
+<p>Usage: <code>input message: 'Do you approve?' ok: "Yes"</code></p>
+
+<p>Which will look like:
+    <pre>
+        Do you approve?
+        Yes or Abort
+    </pre>
+</p>
+

src/main/resources/org/jenkinsci/plugins/workflow/support/steps/input/InputStepExecution/index.jelly

@@ -12,7 +12,7 @@
       </j:forEach>
       <f:block>
         <f:submit value="${it.input.ok}" name="proceed"/>
-        <f:submit value="${%Abort}" name="abort"/>
+        <f:submit value="${it.input.abort}" name="abort"/>
       </f:block>
     </f:form>
   </j:if>