Logs Cleanup: lang entry naming, CSS, use of lang

- Renamed all logs module lang entries prefixed with 'log_' to 'logs_'
- Added lang entries for hard-coded strings in the views as well as
log_activity and log_message calls
- Moved content of style attributes/tags to module css
- Cleaned up formatting in JavaScript, changed applied styles from
'display: block' to 'display: inherit'