add 'Scroll to the end of the conversation' bar

Change-Id: I63e41433db4999d021bc13375cf5b7ba07843c3d
diff --git a/client/src/locale/en/translation.json b/client/src/locale/en/translation.json
index bef16ed..049bc55 100644
--- a/client/src/locale/en/translation.json
+++ b/client/src/locale/en/translation.json
@@ -26,6 +26,8 @@
   "message_input_placeholder_four": "Write to {{member0}}, {{member1}}, {{member2}}, +1 other member",
   "message_input_placeholder_more": "Write to {{member0}}, {{member1}}, {{member2}}, +{{excess}} other members",
 
+  "messages_scroll_to_end": "Scroll to the end of the conversation",
+
   "username_input_default_helper_text": "",
   "username_input_success_helper_text": "Username available",
   "username_input_taken_helper_text": "Username already taken",
diff --git a/client/src/locale/en/translation_old.json b/client/src/locale/en/translation_old.json
new file mode 100644
index 0000000..a1a3e9a
--- /dev/null
+++ b/client/src/locale/en/translation_old.json
@@ -0,0 +1,15 @@
+{
+  "password_input_default_helper_text": "",
+  "password_input_medium_helper_text": "Medium",
+  "password_input_registration_failed_helper_text": "Choose another password!",
+  "password_input_strong_helper_text": "Strong",
+  "password_input_too_weak_helper_text": "Too weak",
+  "password_input_weak_helper_text": "Weak",
+  "severity_error": "Error",
+  "severity_success": "Success",
+  "username_input_default_helper_text": "",
+  "username_input_invalid_helper_text": "Username doesn't follow required pattern",
+  "username_input_registration_failed_helper_text": "Username not correct!",
+  "username_input_success_helper_text": "Username available",
+  "username_input_taken_helper_text": "Username already taken"
+}
diff --git a/client/src/locale/fr/translation.json b/client/src/locale/fr/translation.json
index 97a1cf6..346f0aa 100644
--- a/client/src/locale/fr/translation.json
+++ b/client/src/locale/fr/translation.json
@@ -24,7 +24,9 @@
   "message_input_placeholder_two": "Écrire à {{member0}} et {{member1}}",
   "message_input_placeholder_three": "Écrire à {{member0}}, {{member1}} et {{member2}}",
   "message_input_placeholder_four": "Écrire à {{member0}}, {{member1}}, {{member2}}, +1 autre membre",
-  "message_input_placeholder_more": "Écrire à {{member01}}, {{member1}}, {{member2}}, +{{excess}} autres membres",
+  "message_input_placeholder_more": "Écrire à {{member0}}, {{member1}}, {{member2}}, +{{excess}} autres membres",
+
+  "messages_scroll_to_end": "Faire défiler jusqu'à la fin de la conversation",
 
   "share_screen": "Partager votre écran",
   "share_screen_area": "Partager une partie de l'écran",