I think some changes in code could be useful, in order to improve Google Maps plugin translation to other languages (spanish, in my case).

Look at /lib/class_agm_admin_form_renderer.php file (lines 28-41). Instead of:

function create_map_type_box () {
$opt = get_option('agm_google_maps');
$items = array(
'ROADMAP',
'SATELLITE',
'HYBRID',
'TERRAIN'
);
echo "<select id='map_type' name='agm_google_maps[map_type]'>";
foreach($items as $item) {
$selected = ($opt['map_type'] == $item) ? 'selected="selected"' : '';
echo "<option value='$item' $selected>$item</option>";
}
echo "</select>";

we can write something like:

function create_map_type_box () {
$opt = get_option('agm_google_maps');
$items = array(
'ROADMAP' => __('ROADMAP', 'agm_google_maps'),
'SATELLITE' => __('SATELLITE', 'agm_google_maps'),
'HYBRID' => __('HYBRID', 'agm_google_maps'),
'TERRAIN' => __('TERRAIN', 'agm_google_maps')
);
echo "<select id='map_type' name='agm_google_maps[map_type]'>";
foreach($items as $item=>$label) {
$selected = ($opt['map_type'] == $item) ? 'selected="selected"' : '';
echo "<option value='{$item}' {$selected}>{$label}</option>";
}
echo "</select>";

This way, the items of "map_type" array could be easily translatable. In this file there's another array ("image_size") in which a similar improvement can be done. In fact, my inspiration comes from the array "zoom" of last version of this plugin, where the array items are ready to be translated.