String fix for 'Support Repost'

- Added to json
- Don't need the context note for this case.

static/app-strings.json

@@ -257,6 +257,7 @@
   "Support --[button to support a claim]--": "Support",
   "Support --[noun; transaction type]--": "Support",
   "Support --[used in footer; general help/support]--": "Support",
+  "Support Repost": "Support Repost",
   "Update": "Update",
   "Abandon": "Abandon",
   "Unlock tip": "Unlock tip",

ui/component/claimSupportButton/view.jsx

@@ -27,9 +27,7 @@ export default function ClaimSupportButton(props: Props) {
       className={classnames({ 'button--file-action': fileAction })}
       icon={ICONS.LBC}
       iconSize={fileAction ? 22 : undefined}
-      label={
-        isRepost ? __('Support Repost --[button to support a claim]--') : __('Support --[button to support a claim]--')
-      }
+      label={isRepost ? __('Support Repost') : __('Support --[button to support a claim]--')}
       requiresAuth={IS_WEB}
       title={__('Support this claim')}
       onClick={() => doOpenModal(MODALS.SEND_TIP, { uri, isSupport: true })}