Make full example modules (issue #20)

added message examples

Details of additions/deletions below:
--------------------------------------------------------------

Added:      /BLUE_FRAMEWORK/modules/example_messages/lang/example_messages_error_en-GB.php
            -- Added --
                english error codes

Added:      /BLUE_FRAMEWORK/modules/example_messages/lang/example_messages_error_pl-PL.php
            -- Added --
                polish error codes

Added:      /BLUE_FRAMEWORK/modules/example_messages/lang/example_messages_pl-PL.php
            -- Added --
                polish translations

Added:      /BLUE_FRAMEWORK/modules/example_messages/lang/example_messages_en-GB.php
            -- Added --
                english translations

Modified:   /BLUE_FRAMEWORK/modules/example_messages/layouts/index.html
            -- Updated --
                changed whole structure, added all examples

Modified:   /BLUE_FRAMEWORK/cfg/lang/core_en-GB.php
            -- Added --
                example link description

Modified:   /BLUE_FRAMEWORK/cfg/lang/core_pl-PL.php
            -- Added --
                example link description

Modified:   /BLUE_FRAMEWORK/elements/layouts/examples/examples.html
            -- Added --
                example link description
            -- Removed --
                duplicated link

Modified:   /BLUE_FRAMEWORK/modules/example_messages/example_messages.php
            -- Added --
                all examples code