[TASK] Just rename grid renderer

Split also Permission grid renderer into Permission FE
and Permission BE

Change-Id: Ia4ad5c5afeb3eda19e115fa658d41c93512ff9ef
[FEATURE] Add opposition TCA relation for BE / FE groups

Change-Id: I46d5132eb97c8ebf89ca9e6c9b1a4882b02c5a5a
[FEATURE] Customise main grid

Change-Id: Ic85f10a49ec53d971dcb446c3fc5204dded20d2a
[TASK] Adjust some labels

Change-Id: Ia56ff5423635a0f8e00e53be570e2931fa921afa