[TYPO3-core] RFC: #11044: Move inline JS to external file in backend.php

[Steffen Kamper]

Hi,

as Benni suggested here is an follow-up patch

* used TYPO3.LLL.core for labels coming from locallang_core.xml
* moved the login box to js/loginrefresh.js
* used a second array for files included after the inline part

There is no functional change at all, so i wait 72 hours for veto's 
before i commit.

vg Steffen