This provide a block indent, similar to the Wikipedia template (Block indent). The first parameter is the content that should be indented and the second parameter is the number of indents similar to the amount of preceding colons. If no second parameter is present, it defaults to 1 indent.
Usage:
{{Block indent|Test string #1a}}
: Test string #1b
{{Block indent|Test string #2a|2}}
:: Test string #2b
{{Block indent|Test string #3a|5}}
::::: Test string #3b
Results in:
- Test string #1b
- Test string #2b
- Test string #3b