Disable share button in mobile publisher on submit

closes #6682, closes #6330

Changelog.md

@@ -11,6 +11,7 @@
 * Ensure the rubyzip gem is properly loaded [#6659](https://github.com/diaspora/diaspora/pull/6659)
 * Fix mobile registration layout after failed registration [#6677](https://github.com/diaspora/diaspora/pull/6677)
 * Fix mirrored names when using a RTL language [#6680](https://github.com/diaspora/diaspora/pull/6680)
+* Disable submitting a post multiple times in the mobile UI [#6682](https://github.com/diaspora/diaspora/pull/6682)
 
 ## Features
 * Keyboard shortcuts now do work on profile pages as well [#6647](https://github.com/diaspora/diaspora/pull/6647/files)

app/views/publisher/_publisher.mobile.haml

@@ -31,6 +31,9 @@
     #file-upload-publisher{:title => t('shared.publisher.upload_photos'), :class => 'btn'}
       = image_tag "mobile/camera.png", alt: t("shared.publisher.upload_photos").titleize
     #publisher_mobile
-      = submit_tag t('shared.publisher.share'), :class => 'btn primary', :id => "submit_new_message"
+      = submit_tag t("shared.publisher.share"),
+        class: "btn primary",
+        id: "submit_new_message",
+        data: {"disable-with" => t("shared.publisher.posting")}
 
     #publisher_photo_upload