typo in logger messages and variable names

[7aman]

There is some typos in logger messages:

• stoped in scripts\mainwindow.py:2027
• occured in scripts\mainwindow.py:1862,5559
• manuall in scripts\check_proxy.py:81,88,96,107

also occurred is misspelled as occured in resources\locale files.

[7aman]

intended or un-intended typos in variable names:

• unkownargs in scripts\persepolis.py
• link_clipborad in scripts\mainwindow.py
• final_path_pluse_name in scripts\useful_tools.py
• humanReadbleSize in scripts\download.py, spider.py, useful_tools.py

[7aman]

fixed in https://github.com/7aman/persepolis/tree/fix-typo