Change some words like "Average" -> "Avg"

Currently it's not easy to do within Fivestar. I'd suggest trying out the String Overrides module.

I'm pretty sure it will work. You just have to look for the correct strings. For example it's "Average" not "Average:". String Overrides can replace any string that's wrapped in t() in the source code, and since Fivestar is fully translatable, it should find it just as the translated versions of Fivestar have.

I don't *think* you have to clear the cache, but it's not going to hurt clicking "clear all caches" on admin/settings/performance.

the string is

t('Average')

If string overwrite does not work for you, you could enable the locale module and translate the ord into a custom english language, but using string overwrites should be much better

well, the problem is in line 257 of fivestar.theme.inc (v 7.x-2.0-alpha2) :

function theme_fivestar_summary($variables) {
 ...
    $output .= '<span class="average-rating">'. t('Average: <span !microdata>!stars</span>', array('!stars' => $average_stars, '!microdata' => $average_rating_microdata)) .'</span>';

t('Average: !stars') can't be translated as it contains forbidden html and should be changed to :

    $output .= '<span class="average-rating">'. t('Average: ').
    '<span ' . $average_rating_microdata . '>' . $average_stars . '</span>' .
    '</span>';

reopening the issue so we can solve the t() string problem

The code in #9 works to me.

Duplicate of Cannot translate Average: !stars. I've applied the patch there - it's in the latest 7.x-2.x-dev version.