Code that might execute at runtime should not call st() directly

Looking at the code there are a couple places (in hook_requirements() and hook_install()) that call the st() function directly.

Since these hooks can sometimes run while Drupal is being installed and sometimes after it's already installed, they should actually use get_t() to automatically get the correct function, t() or st(), to use.

For example, instead of:

  $requirements['phpdom'] = array(
    'title' => st('PHP document object model'),
  );

Do

    $t = get_t(); // At the top of the function.

  $requirements['phpdom'] = array(
    'title' => $t('PHP document object model'),
  );

While at it, I'm also wondering if the message in hook_install() should actually just be removed?

function learning_registry_install() {
  drupal_set_message((st('Installing learning_registry.')));

Since most modules don't set such a message and Drupal already prints a standard message when modules are installed via the modules page, it seems like it might be a bit inconsistent and out of place.