To Install it manually

• Unzip the plugin in the moodle .../filter/ directory.
• Enable it from "Site Administration >> Plugins >> Filters >> Manage filters".

To Use it

• Create your contents in multiple languages.
• Enclose every language content between {mlang NN} and {mlang} tags:

    {mlang XX}content in language XX{mlang}
    {mlang YY}content in language YY{mlang}
  

where XX and YY are the Moodle short names for the language packs (i.e., en, fr, de, etc.)
- Test it (by changing your browsing language in Moodle).

How it works

• Look for "lang blocks" in the code.
• For each "lang block":
  • If there are texts in the currently active language, print them.
  • Else, if there exists texts in the current parent language, print them.
  • Else, don't print any text inside the lang block.
• Text outside of "lang blocks" will always be shown.

Definition of "lang block"

Is any text (including spaces, tabs, linefeeds or return characters) placed between '{mlang XX}' and '{mlang}' markers. You can not only put text inside "lang block", but also images, videos or external embedded content. For example, this is a valid "lang block":

{mlang es}
First paragraph of text. First paragraph of text. First paragraph of text.

Second paragraph of text. Second paragraph of text. Second paragraph of text.

((-- An image goes here --))

Third paragraph of text. Third paragraph of text. Third paragraph of text.

((-- A Youtube video goes here --))

Fourth paragraph of text. Fourth paragraph of text. Fourth paragraph of text.
{mlang}

One example in action

• This text:

  {mlang en}Hello!{mlang}{mlang es}¡Hola!{mlang}
  This text is common for all languages because it's outside of all lang blocks.
  {mlang en}Bye!{mlang}{mlang it}Ciao!{mlang}
  

• If the current language is English, it will print:

  Hello!
  This text is common for all languages because it's outside of all lang blocks.
  Bye!
  

• If the current language is Spanish, it will print:

  ¡Hola!
  This text is common for all languages because it's outside of all lang blocks.
  

Notice the final 'Bye!' / 'Ciao!' is not printed. - If the current language is Italian, it will print:

  This text is common for all languages because it's outside of all lang blocks.
  Ciao!
  

Notice the leading 'Hello!' / '¡Hola!' is not printed.