Which filter affects the ‘entry-title’ post class

The filter that allows you to tweak the title value is [wp_title][1]. As mentioned by the commenters, the entry-title is a class pertaining to your theme.

If you need to set a class according to a certain value, try something like this
in your template file:

<h1 class="<?php echo ($in_category_a) ? 'align-left': ''; ?>"><?php the_title();?></h1>

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