Menu: Rename "Groups interface" into "Groups"

[mlep]

Here is the View menu:

Is your suggestion for improvement related to a problem? Please describe.
The Web search interface is named Web search.
The OpenOffice/LibreOffice interface is named OpenOffice/LibreOffice.

Why to name the Groups interface Groups interface?

Describe the solution you'd like
Naming it Groups should be enough.

[Siedlerchr]

jabref/src/main/java/org/jabref/gui/actions/StandardActions.java

Line 85 in b1338b1

TOGGLE_GROUPS(Localization.lang("Groups interface"), IconTheme.JabRefIcons.TOGGLE_GROUPS, KeyBinding.TOGGLE_GROUPS_INTERFACE),

This line and in the l10n-en needs to be changed