Change to absolute log dir dev

Sometimes the viewlog doesn't show any text.

On my system it looked like it had to do with the log folder being relative.
Changed that first. 

While testing noticed that changing Logs folder in config, save changes keeps spinning and doesn't release the old log file. Changed that also.

Using an absolute logdir didn´t solve empty viewlog on other systems.
Found out that in other languages the month can contain special character like August is Ağustos in Turkish. The regex doesn´t handle this correctly.

Changed all dates to numbers %Y-%m-%d to solve (also more consistent)