Translation of UI (german and english)

Bugfix for feeds
    - removed categories related and up
    - load new books now working
    - category random now working
login page is free of non accessible elements
boolean custom column is vivible in UI
books with only with certain languages can be shown
book shelfs can be deleted from UI
Anonymous user view is more resticted
Added browse of series in sidebar
Dependencys in vendor folder are updated to newer versions (licencs files are now present)
Bugfix editing Authors names
Made upload on windows working

vendor/tornado/stack_context.py

@@ -41,13 +41,13 @@ Example usage::
             sys.exit(1)
 
     with StackContext(die_on_error):
-        # Any exception thrown here *or in callback and its desendents*
+        # Any exception thrown here *or in callback and its descendants*
         # will cause the process to exit instead of spinning endlessly
         # in the ioloop.
         http_client.fetch(url, callback)
     ioloop.start()
 
-Most applications shouln't have to work with `StackContext` directly.
+Most applications shouldn't have to work with `StackContext` directly.
 Here are a few rules of thumb for when it's necessary:
 
 * If you're writing an asynchronous library that doesn't rely on a
@@ -266,6 +266,18 @@ def wrap(fn):
     # TODO: Any other better way to store contexts and update them in wrapped function?
     cap_contexts = [_state.contexts]
 
+    if not cap_contexts[0][0] and not cap_contexts[0][1]:
+        # Fast path when there are no active contexts.
+        def null_wrapper(*args, **kwargs):
+            try:
+                current_state = _state.contexts
+                _state.contexts = cap_contexts[0]
+                return fn(*args, **kwargs)
+            finally:
+                _state.contexts = current_state
+        null_wrapper._wrapped = True
+        return null_wrapper
+
     def wrapped(*args, **kwargs):
         ret = None
         try: