WordPress has a ridiculous number of translation functions to make your life easier. Remember them.

The basics:

• __() – Translate a string
• _e() – Echo the translated string
• _x() – Tell the poor translater what they’re translating
• _ex() – Tell the poor translater what they’re translating and echo the translated string

Escape the output:

• esc_attr__() – Escape the translation for HTML attributes
• esc_attr_e() – Escape and echo the translation for HTML attributes
• esc_attr_x() – Escape the translation for HTML attributes and tell the translator what they’re translating
• esc_html__() – Escape the translation for HTML code
• esc_html_e() – Escape and echo the translation for HTML code
• esc_html_x() – Escape the translation for HTML code and tell the translator what they’re translation

Handle plurals

• _n()
• _nx() – Tell the poor translater what plurals they’re translating
• _n_noop() – WTF is a noop? Konstantin knows
• _nx_noop() – More noops, but you can tell the poor translator what they’re translating
• translate_nooped_plural() – Actually translate your noops.