Watermark language issue (with fix suggestion)

Watermark works only with English language. When you make use of the Locale module and switch to another language (e.g. German) it wont work.
Because $size['label'] (on code line 141) holds the translated string and not the array-key defined by image module.

Fix suggestion:

replace following code in watermark.module (line 140 to 152):

  foreach (_image_get_sizes() as $size) {
    $label_list[] = $size['label'];
  }
  $label_list[] = IMAGE_ORIGINAL;

  foreach ($label_list as $label) {
    $label_var = WATERMARK . $label;
    $form['watermark']['labels'][$label_var] = array(
      '#type' => 'checkbox',
      '#title' => $label,
      '#default_value' => variable_get($label_var, false),
    );
  }

with:

  foreach (_image_get_sizes() as $key => $size) {
    $label_list[$key] = $size['label'];
  }  

  foreach ($label_list as $key => $label) {
    $label_var = WATERMARK . $key;
    $form['watermark']['labels'][$label_var] = array(
      '#type' => 'checkbox',
      '#title' => $label,
      '#default_value' => variable_get($label_var, false),
    );
  }