[ticket/8785] Rebuilding posting_editor pm head + new language vars

PHPBB3-8785
[ticket/8785] Little spaces mistake

PHPBB3-8785
[ticket/8785] Scrollbar to Reciepients and BCC with max-height: 200px

PHPBB3-8785
[ticket/8785] Adds two <hr /> to seperate recipients and BCC

PHPBB3-8785
[ticket/8785] Adds a new optical improvement, new file and fixes html bugs

PHPBB3-8785
[ticket/8785] Adds blank lines at file end

PHPBB3-8785
[ticket/8785] <hr /> will only displayed when needed

PHPBB3-8785
[ticket/8785] pm_layout.html back to more standard code

PHPBB3-8785
[ticket/8785] Just one blank line

PHPBB3-8785
[ticket/8785] and again a fresh line

PHPBB3-8785
[ticket/8785] Fixed problem with add empty.png and travis will now pass

PHPBB3-8785
[ticket/8785] Deletes additional add and add_bcc buttons

PHPBB3-8785
Merge remote-tracking branch 'crizz0/ticket/8785' into develop

* crizz0/ticket/8785:
  [ticket/8785] Deletes additional add and add_bcc buttons
  [ticket/8785] Fixed problem with add empty.png and travis will now pass
  [ticket/8785] and again a fresh line
  [ticket/8785] Just one blank line
  [ticket/8785] pm_layout.html back to more standard code
  [ticket/8785] <hr /> will only displayed when needed
  [ticket/8785] Adds blank lines at file end
  [ticket/8785] Adds a new optical improvement, new file and fixes html bugs
  [ticket/8785] Adds two <hr /> to seperate recipients and BCC
  [ticket/8785] Scrollbar to Reciepients and BCC with max-height: 200px
  [ticket/8785] Little spaces mistake
  [ticket/8785] Rebuilding posting_editor pm head + new language vars