Best way is to ask the developer to translate it, or ask in the german forum if someone will be so kind.
Many developers publish their extension in an englich version as otherwise it can not be found on contao.org by searching the ER. But they are not able to translate or have no time.
cm_membergooglemaps is no core module.
Here my attempt
Code:
$GLOBALS['TL_LANG']['tl_member_group']['cm_membergooglemaps_mapview'] = "Map view";
$GLOBALS['TL_LANG']['tl_member_group']['cm_map_iconstd']['0'] = "Group specific marker icon - default";
$GLOBALS['TL_LANG']['tl_member_group']['cm_map_iconstd']['1'] = "Choose the icon for that group. If you choose none the default icon will be used.";
$GLOBALS['TL_LANG']['tl_member_group']['cm_map_iconnear']['0'] = "Group specific marker icon - near range";
$GLOBALS['TL_LANG']['tl_member_group']['cm_map_iconnear']['1'] = "Choose the icon to be used for this group as result of the radial search. If you choose none the default icon will be used.";
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