Static strings not translated

Function lti_tool_provider_launch has a number of error strings that are not translated.
It also has a return statement at the end that should never be reached courtesy of #1858628: lti_tool_provider_goto wrapper should function like the thing is wrapping.

The 'None' in lti_tool_provider_og_get_group_bundles and lti_tool_provider_og_retrieve_entity_field_types.

lti_tool_provider_og_lti_tool_provider_launch_alter has a drupal_set_message without translation, and that has a param inline. Just covert to use t(). Any params included with @param are already run through check_plain for you.

lti_tool_provider_og_group_mapping missing translation on most form item #description

There may be others I have missed.