i18n: Sync translations from Transifex

Thanks as always to our kind volunteer translators.

static/translations/messages_el.json

@@ -3,7 +3,7 @@
   "If there are other details you would like to share, please write them here.": "If there are other details you would like to share, please write them here.",
   "App version": "App version",
   "Server version": "Server version",
-  "Active": "Active",
+  "Active": "Ενεργό",
   "Idle": "Idle",
   "Offline": "Offline",
   "Unavailable": "Unavailable",
@@ -109,7 +109,7 @@
   "Failed to connect to server: {realm}": "Failed to connect to server: {realm}",
   "{_}": "{_}",
   "Home": "Home",
-  "All messages": "All messages",
+  "All messages": "Όλα τα μηνύματα",
   "Direct messages": "Direct messages",
   "Starred": "Starred",
   "Mentions": "Mentions",
@@ -135,7 +135,7 @@
   "Log out": "Log out",
   "This will log out {email} on {realmUrl} from the mobile app on this device.": "This will log out {email} on {realmUrl} from the mobile app on this device.",
   "Add new account": "Add new account",
-  "All streams": "All streams",
+  "All streams": "Όλες οι ροές",
   "Email": "Email",
   "Username": "Username",
   "Password": "Password",
@@ -330,12 +330,12 @@
   "Pinned": "Pinned",
   "Mark messages as read on scroll": "Mark messages as read on scroll",
   "When scrolling through messages, should they automatically be marked as read?": "When scrolling through messages, should they automatically be marked as read?",
-  "Always": "Always",
+  "Always": "Πάντα",
   "Never": "Never",
   "Only in conversation views": "Only in conversation views",
   "Messages will be automatically marked as read only when viewing a single topic or direct message conversation.": "Messages will be automatically marked as read only when viewing a single topic or direct message conversation.",
   "Topics": "Topics",
-  "Add subscribers": "Add subscribers",
+  "Add subscribers": "Προσθήκη συνδρομητών",
   "Subscribe": "Subscribe",
   "Unsubscribe": "Unsubscribe",
   "Set yourself to away": "Set yourself to away",
@@ -363,7 +363,7 @@
   "Out sick": "Out sick",
   "Vacationing": "Vacationing",
   "Working remotely": "Working remotely",
-  "At the office": "At the office",
+  "At the office": "Στο γραφείο",
   "This message was hidden because it is from a user you have muted. Long-press to view.": "This message was hidden because it is from a user you have muted. Long-press to view.",
   "Signed out": "Signed out",
   "Remove account": "Remove account",