On case insensitive systems, @lang('Auth') would match the auth.php file
and return an array instead of the string "Auth", causing a "Array to string conversion error"
* Refactor: use get_state_label() for the overview
* Move state translation to get_state_label()
Several html pages used similar database calls and sometimes very
different methodology to determine the state label and state text
before calling get_state_label(), so moved that part of the task
into the function itself instead of replicating the same code
multiple times on different pages.
* Move label creation to get_sensor_label_color()
Also removed a duplicate sensor class to unit function.
* Refactor some if/else statements for simplicity.
* Enable state translations for the inventory page.
* Remove blank line found at end of control structure
* Enable unit translation, fix typos.
* Change to dbFetchRow(), return string directly.
* Update functions.inc.php
* Stop displaying the raw value on state labels.
* Apply 1c7c3ca change for default case too.
Jellyfrog
Martijn Schmidt
Tony Murray