Create/Update assets for version 1.7.8

assets/minecraft/lang/en_US.lang

@@ -1796,6 +1796,8 @@ stream.user.subscription.turbo=Twitch Turbo
 stream.unavailable.title=Twitch Broadcasting Unavailable
 stream.unavailable.report_to_mojang=Report to Mojang
 
+stream.confirm_start=Are you sure you want to start broadcasting?
+
 stream.unavailable.account_not_bound=Before you can broadcast Minecraft through Twitch, you will need to link your Twitch account on mojang.com. Would you like to do that now?
 stream.unavailable.account_not_bound.okay=Link Accounts
 stream.unavailable.account_not_migrated=Before you can broadcast Minecraft through Twitch, you will need to migrate your Minecraft account to a Mojang account. Would you like to do that now?

version.json

@@ -1,8 +1,8 @@
 {
-  "id": "1.7.6",
+  "id": "1.7.8",
   "type": "release",
-  "url": "https://launchermeta.mojang.com/mc/game/5db5d5ef5a5c54df1fe19ca58654ee8d22f7c5bc/1.7.6.json",
+  "url": "https://launchermeta.mojang.com/mc/game/d55f47587bc5f0eff46d5f002aad440c0f821aea/1.7.8.json",
   "time": "2016-06-01T11:45:48+00:00",
-  "releaseTime": "2014-04-09T07:52:06+00:00",
-  "downloadTimestamp": 1487425106493
+  "releaseTime": "2014-04-09T07:58:16+00:00",
+  "downloadTimestamp": 1487425046589
 }