Add missing translation keys

i18n/en.i18n.json

 {
   "Access_online_demo" : "Access the online demo",
   "Access_Online_Demo" : "Access the Online Demo",
+  "Accounts": "Accounts",
   "Accounts_denyUnverifiedEmail" : "Deny unverified e-mail",
   "Accounts_EmailVerification" : "E-mail Verification",
   "Accounts_OAuth_Facebook" : "Facebook Login",
@@ -40,6 +41,7 @@
   "All_channels" : "All channels",
   "Allow_Invalid_SelfSigned_Certs" : "Allow invalid and Self-Signed SSL certificate's for link validation and previews",
   "and" : "and",
+  "API" : "API",
   "API_Analytics" : "Analytics",
   "API_Embed" : "Embed",
   "are_also_typing" : "are also typing",
@@ -104,6 +106,7 @@
   "Forgot_password" : "Forgot your password",
   "Fork_it_on_github" : "Fork it on github",
   "From_Email" : "From Email",
+  "General": "General",
   "Get_to_know_the_team" : "Get to know the Rocket.Team",
   "github_no_public_email" : "You don't have any email as public email in your GitHub account",
   "Have_your_own_chat" : "Have your own web chat. Developed with Meteor.com, the Rocket.Chat is a great solution for developers looking forward to build and evolve their own chat platform.",
@@ -132,6 +135,7 @@
   "Language_Version" : "English Version",
   "Last_login" : "Last login",
   "Last_message" : "Last message",
+  "Layout" : "Layout",
   "Layout_Home_Body" : "Home Body",
   "Layout_Home_Title" : "Home Title",
   "Layout_Login_Header" : "Login Header",
@@ -140,6 +144,7 @@
   "Layout_Sidenav_Footer" : "Side Navigation Footer",
   "Layout_Sidenav_Footer_description" : "Footer size is 260x70",
   "Layout_Terms_of_Service" : "Terms of Service",
+  "LDAP" : "LDAP",
   "Leave_room" : "Leave room",
   "line" : "line",
   "Load_more" : "Load more",
@@ -161,12 +166,14 @@
   "Message_AllowPinning" : "Allow Message Pinning",
   "Message_deleting_not_allowed" : "Message deleting not allowed",
   "Message_editing_not_allowed" : "Message editing not allowed",
+  "Message_MaxAllowedSize" : "Message max allowed size",
   "Message_pinning_not_allowed" : "Message pinning not allowed",
   "Message_KeepHistory" : "Keep Message History",
   "Message_removed" : "Message removed",
   "Message_pinned" : "Message pinned",
   "Message_ShowDeletedStatus" : "Show Deleted Status",
   "Message_ShowEditedStatus" : "Show Edited Status",
+  "Meta" : "Meta",
   "Meta_fb_app_id" : "Facebook APP ID",
   "Meta_google-site-verification" : "Google Site Verification",
   "Meta_language" : "Language",
@@ -214,6 +221,7 @@
   "Profile" : "Profile",
   "Profile_saved_successfully" : "Profile saved successfully",
   "Proudly_developed" : "Proudly developed with Meteor",
+  "Push" : "Push",
   "Push_apn_cert" : "APN Cert",
   "Push_apn_dev_cert" : "APN Dev Cert",
   "Push_apn_dev_key" : "APN Dev Key",
@@ -237,6 +245,7 @@
   "Room_name_changed_successfully" : "Room name changed successfully",
   "Room_not_found" : "Room not found",
   "room_user_count" : "%s users",
+  "Rooms" : "Rooms",
   "Save" : "Save",
   "Save_changes" : "Save changes",
   "Save_Mobile_Bandwidth" : "Save Mobile Bandwidth",
@@ -259,12 +268,15 @@
   "Silence" : "Silence",
   "since_creation" : "since %s",
   "Site_Name" : "Site Name:",
+  "SAML" : "SAML",
+  "SMTP" : "SMTP",
   "SMTP_Host" : "SMTP Host",
   "SMTP_Password" : "SMTP Password",
   "SMTP_Port" : "SMTP Port",
   "SMTP_Username" : "SMTP Username",
   "Sound" : "Sound",
   "Start_of_conversation" : "Start of conversation",
+  "Statistics" : "Statistics",
   "Stats_Active_Users" : "Active Users",
   "Stats_Avg_Channel_Users" : "Average Channel Users",
   "Stats_Avg_Private_Group_Users" : "Average Private Group Users",
@@ -321,6 +333,7 @@
   "User_removed_by" : "User <em>__user_removed__</em> removed by <em>__user_by__</em>.",
   "User_Settings" : "User Settings",
   "User_updated_successfully" : "User updated successfully",
+  "Users": "Users",
   "Username" : "Username",
   "Username_cant_be_empty" : "The username cannot be empty",
   "Username_description" : "The username is used to allow others to mention you in messages.",