Added GroupPinnedStatuses

• Added:
- GroupPinnedStatuses
- controllers for timeline, creation, deletion
- redux actions, reducers for creation, deletion
- timeline fetching in timelines action
- options to pin, unpin in status options popover for group admin

config/locales/en.yml

@@ -933,6 +933,11 @@ en:
       ownership: Someone else's gab cannot be pinned
       private: Non-public gabs can't be pinned
       reblog: A repost cannot be pinned
+    group_pin_errors:
+      limit: You have already pinned the maximum number of gabs for groups
+      ungrouped: Gabs not made in the group cannot be pinned
+      reblog: A repost cannot be pinned
+      notGroupStatus: The status you are attempting to pin is not associated with the given group
     poll:
       total_votes:
         one: "%{count} vote"

config/locales/en_GB.yml

@@ -873,6 +873,11 @@ en_GB:
       ownership: Someone else's toot cannot be pinned
       private: Non-public toot cannot be pinned
       reblog: A repost cannot be pinned
+    group_pin_errors:
+      limit: You have already pinned the maximum number of gabs for groups
+      ungrouped: Gabs not made in the group cannot be pinned
+      reblog: A repost cannot be pinned
+      notGroupStatus: The status you are attempting to pin is not associated with the given group
     poll:
       total_votes:
         one: "%{count} vote"