DownloadRulesTab: move RegEx test to new row and use a better description

client/src/javascript/components/modals/feeds-modal/DownloadRulesTab.tsx

@@ -235,6 +235,8 @@ class DownloadRulesTab extends React.Component<WrappedComponentProps, DownloadRu
             defaultValue={rule.exclude}
             width="three-eighths"
           />
+        </FormRow>
+        <FormRow>
           <Textbox
             addonPlacement="after"
             id="check"

client/src/javascript/i18n/strings.compiled.json

@@ -650,7 +650,7 @@
   "feeds.check": [
     {
       "type": 0,
-      "value": "Test Match Pattern"
+      "value": "Validate the rule by trying it out. Not saved or sent."
     }
   ],
   "feeds.exclude": [

client/src/javascript/i18n/strings.json

@@ -61,7 +61,7 @@
   "feeds.add.feed": "Add Feed",
   "feeds.applicable.feed": "Applicable Feed",
   "feeds.apply.tags": "Apply Tags",
-  "feeds.check": "Test Match Pattern",
+  "feeds.check": "Validate the rule by trying it out. Not saved or sent.",
   "feeds.exclude.pattern": "Exclude Pattern",
   "feeds.existing.feeds": "Existing Feeds",
   "feeds.existing.rules": "Existing Rules",