Progress state shortened

Rewritten-docs.md

@@ -666,47 +666,18 @@ arbitrary number of tasks with other types.
 
 ### Evaluation progress state
 
-Users surely want to know progress state of their submitted solution this kind
-of functionality comes particularly handy in long duration exercises. Because of
-reporting progress users have immediate knowledge if anything goes wrong, not
-mention psychological effect that whole system and its parts are working and
-doing something. That is why this feature was considered from beginning but
-there are multiple ways how to look at it in particular.
-
-The very first idea would be to provide progress state based on done messages
-from compilation, execution and evaluation. Which is something what a lot of
-evaluation systems are providing. These information are high level enough for
-users and they probably know what is going on and executing right now. If
-compilation fails users know that their solution is not compilable, if execution
-fails there were some problems with their program. The clarity of this kind of
-progress state is nice and understandable. But as we learnt ReCodEx has to have
-more advanced execution pipeline there can be more compilations or more
-executions. And in addition parts of the system which ensure execution of users
-solutions do not have to precisely know what they are executing at the moment.
-This kind of information may be meaningless for them.
-
-That is why another solution of progress state was considered. As we know right
-now one of the best ways how to ensure generality is to have jobs with
-single-purpose tasks. These tasks can be anything, some internal operation or
-execution of external and sandboxed program. Based on this there is one very
-simple solution how to provide general progress state which should be
-independent on task types. We know that job has some number of tasks which has
-to be executed so we can send state info after execution of every task. And that
-is how we get percentual completion of an execution. Yes, it is kind of boring
-and standard way but on top of that there can be built something else and more
-appealing to users.
-
-So displaying progress to users can be done numerous ways. We have percentual
-completion which is of course begging for simple solution which is displaying
-only the percentage or some kind of standard graphical progress bar. But that is
-too mainstream lets try something else. Very good idea is to have some kind of
-puzzled image or images which will be composed together according to progress.
-Nice way but kind of challenging if we do not have designer around. Another
-original solution is to have database of random kind-of-funny statements which
-will be displayed every time task is completed. It is easy enough for
-implementation and even for making up these messages and it is quite new and
-original. That is why this last solution was chosen for displaying progress
-state.
+Users surely want to know a progress state of their submitted solution. The very
+first idea would be to report state based on done messages from compilation,
+execution and evaluation as a lot of evaluation systems are already providing.
+However the ReCodEx have more advanced execution pipeline where there can be
+more compilations or more executions per test and also other technical tasks
+controlling the job execution flow. The users do not know about these technical
+details and data from this tasks may confuse them. A solution is to show users
+only percentual completion of the job as a plain progress bar without additional
+information about task types. This solution works well for all of the jobs and
+is very user friendly. To make the output more interesting, there is a database
+of random kind-of-funny statements and a random new one is displayed every time
+a task is completed.
 
 ### Results of evaluation