In your init() method, you would have a line like this:
$this->title = get_string('support');
The get_string() tries to find the string you gave it within /lang/*/moodle.php (unless you give it a specific filename to search). The square brackets mean that the string 'support' doesn't exist in the file you're searching. To keep the changes local, create a language file within your block directory, something like:
/blocks/BLOCKNAME/lang/en/block_BLOCKNAME.php
Where BLOCKNAME is the name of your block. And in that file you can put lines like:
$string['support'] = 'Support';
You would then want to change your init method to instead look like this:
$this->title = get_string('support', 'block_BLOCKNAME.php');
This would tell get_string() to look for $string['support'] within the language file you've created. You can do this for any strings that your block will display and it allows people to easily change your block to use different languages just by making a new language file for their language.