diff --git a/services/web/locales/en-GB.json b/services/web/locales/en-GB.json
index 954660507a..b48cbc7e33 100644
--- a/services/web/locales/en-GB.json
+++ b/services/web/locales/en-GB.json
@@ -1,4 +1,6 @@
 {
+  "expand": "Expand",
+  "collapse": "Collapse",
   "file_outline": "File outline",
   "the_file_outline_is_a_new_feature_click_the_icon_to_learn_more": "The <0>File outline</0> is a new feature. Click the icon to learn more",
   "we_cant_find_any_sections_or_subsections_in_this_file": "We can’t find any sections or subsections in this file",
diff --git a/services/web/locales/en-US.json b/services/web/locales/en-US.json
index 954660507a..b48cbc7e33 100644
--- a/services/web/locales/en-US.json
+++ b/services/web/locales/en-US.json
@@ -1,4 +1,6 @@
 {
+  "expand": "Expand",
+  "collapse": "Collapse",
   "file_outline": "File outline",
   "the_file_outline_is_a_new_feature_click_the_icon_to_learn_more": "The <0>File outline</0> is a new feature. Click the icon to learn more",
   "we_cant_find_any_sections_or_subsections_in_this_file": "We can’t find any sections or subsections in this file",
diff --git a/services/web/locales/en.json b/services/web/locales/en.json
index 954660507a..b48cbc7e33 100644
--- a/services/web/locales/en.json
+++ b/services/web/locales/en.json
@@ -1,4 +1,6 @@
 {
+  "expand": "Expand",
+  "collapse": "Collapse",
   "file_outline": "File outline",
   "the_file_outline_is_a_new_feature_click_the_icon_to_learn_more": "The <0>File outline</0> is a new feature. Click the icon to learn more",
   "we_cant_find_any_sections_or_subsections_in_this_file": "We can’t find any sections or subsections in this file",