This may be a rare case, but if you call the get_terms(); function to retrieve a custom taxonomy array, and you are using the WPML (WordPress Multilingual) plugin for language translation, there is an undocumented (see below) argument that you will need to use.
If, for example, your custom taxonomy, “Birds,” has a the following terms: hummingbird, sparrow, dove, crow, parrot, hawk. You can use WPML to add Spanish translations: colibrí, gorrión, paloma, cuervo, loro, halcón. To display a list of the birds taxonomy, you would call:
I have been a fan of the auto-embed feature in WordPress ever since it was introduced. Auto-embeds are powered by the oEmbed protocol. When you enter a YouTube link, the protocol grabs the embed from YouTube and displays it.