feat: add missing translation keys

public/language/en-GB/topic.json

@@ -1,5 +1,6 @@
 {
 	"topic": "Topic",
+	"title": "Title",
 
 	"no_topics_found": "No topics found!",
 	"no_posts_found": "No posts found!",
@@ -129,6 +130,7 @@
 	"move_post": "Move Post",
 	"post_moved": "Post moved!",
 	"fork_topic": "Fork Topic",
+	"enter-new-topic-title": "Enter new topic title",
 	"fork_topic_instruction": "Click the posts you want to fork",
 	"fork_no_pids": "No posts selected!",
 	"no-posts-selected": "No posts selected!",