Implements more userfriendly error messages for connection errors

...main/java/de/kuschku/quasseldroid/ui/chat/ChatActivity.kt

...java/de/kuschku/quasseldroid/util/backport/OsConstants.kt

app/src/main/java/libcore/io/ErrnoException.java

app/src/main/res/values-de/strings_error.xml

app/src/main/res/values-fr-rCA/strings_error.xml

app/src/main/res/values-lt/strings_error.xml

app/src/main/res/values-pt/strings_error.xml

app/src/main/res/values-sr/strings_error.xml

app/src/main/res/values/strings_error.xml

...n/java/de/kuschku/libquassel/connection/CoreConnection.kt

...kuschku/libquassel/connection/ProtocolVersionException.kt

lib/src/main/java/de/kuschku/libquassel/session/ISession.kt

lib/src/main/java/de/kuschku/libquassel/session/Session.kt

...main/java/de/kuschku/libquassel/session/SessionManager.kt

...ava/de/kuschku/quasseldroid/viewmodel/QuasselViewModel.kt