Index: bp-themes/bp-default/sidebar.php
===================================================================
--- bp-themes/bp-default/sidebar.php	(revision 3054)
+++ bp-themes/bp-default/sidebar.php	(working copy)
@@ -47,7 +47,7 @@
 			<p class="forgetmenot"><label><input name="rememberme" type="checkbox" id="sidebar-rememberme" value="forever" /> <?php _e( 'Remember Me', 'buddypress' ) ?></label></p>
 
 			<?php do_action( 'bp_sidebar_login_form' ) ?>
-			<input type="submit" name="wp-submit" id="sidebar-wp-submit" value="<?php _e('Log In'); ?>" tabindex="100" />
+			<input type="submit" name="wp-submit" id="sidebar-wp-submit" value="<?php _e( 'Log In', 'buddypress' ); ?>" tabindex="100" />
 			<input type="hidden" name="testcookie" value="1" />
 		</form>