String Override limited to certain pages?
The 'votes' text seems to be hard-coded into the theme_fivestar_summary() function (around line 264 of 'includes/fivestar.theme.inc'). It is run through format_plural() (so will eventually make itself available to string overrides), but I don't know of a way of defining complex conditions/contexts for string overrides.

The only (easy) way I can see to solve this is to re-implement that theme function in your own theme, copying the full function code from theme_fivestar_summary() to MYTHEME_fivestar_summary(), and introducing a contextual condition to alter the specific text that you want to change.

You'd be basically looking at changing these lines:

if (isset($votes) &amp;&amp; !(isset($user_rating) || isset($average_rating))) {
  $output .= ' &lt;span class="total-votes"&gt;'. format_plural($votes, '&lt;span&gt;@count&lt;/span&gt; vote', '&lt;span&gt;@count&lt;/span&gt; votes') .'&lt;/span&gt;';
  $div_class = 'count';
}
elseif (isset($votes)) {
  $output .= ' &lt;span class="total-votes"&gt;('. format_plural($votes, '&lt;span&gt;@count&lt;/span&gt; vote', '&lt;span&gt;@count&lt;/span&gt; votes') .')&lt;/span&gt;';
}


to:

$context = MYTHEME_get_fivestar_context();
if ($context == 'something') {
  $metric = 'review';
}
else if ($context == 'something_else') {
  $metric = 'vote';
}

if (isset($votes) &amp;&amp; !(isset($user_rating) || isset($average_rating))) {
  $output .= ' &lt;span class="total-votes"&gt;'. format_plural($votes, '&lt;span&gt;@count&lt;/span&gt; ' . $metric, '&lt;span&gt;@count&lt;/span&gt; ' . $metric . 's') .'&lt;/span&gt;';
  $div_class = 'count';
}
elseif (isset($votes)) {
  $output .= ' &lt;span class="total-votes"&gt;('. format_plural($votes, '&lt;span&gt;@count&lt;/span&gt; ' . $metric, '&lt;span&gt;@count&lt;/span&gt; ' . $metric . 's') .')&lt;/span&gt;';
}


It's not particularly pretty, but I think it's about the most efficient way to do it.