$ ack DB_SLAVE
messagegroups/RecentAdditionsMessageGroup.php
38:             $db = wfGetDB( DB_SLAVE );

messagegroups/RecentMessageGroup.php
55:             $db = wfGetDB( DB_SLAVE );
67:             $db = wfGetDB( DB_SLAVE );
93:             $db = wfGetDB( DB_SLAVE );

scripts/fuzzy.php
153:            $dbr = wfGetDB( DB_SLAVE );

scripts/create-language-models.php
50:                     $dbr = wfGetDB( DB_SLAVE );

specials/SpecialLanguageStats.php
517:            $db = wfGetDB( DB_SLAVE );

specials/SpecialTranslations.php
161:            $dbr = wfGetDB( DB_SLAVE );

specials/SpecialSupportedLanguages.php
62:             $dbr = wfGetDB( DB_SLAVE );
180:            $dbr = wfGetDB( DB_SLAVE );
213:            $dbr = wfGetDB( DB_SLAVE );
245:            $dbr = wfGetDB( DB_SLAVE );
372:            $dbr = wfGetDB( DB_SLAVE );

specials/SpecialTranslationStats.php
403:            $dbr = wfGetDB( DB_SLAVE );
782:            $db = wfGetDB( DB_SLAVE );
829:            $db = wfGetDB( DB_SLAVE );
1021:           $db = wfGetDB( DB_SLAVE );

specials/SpecialTranslate.php
800:            $dbr = wfGetDB( DB_SLAVE );

api/ApiHardMessages.php
99:             $dbr = wfGetDB( DB_SLAVE );

api/ApiQueryMessageTranslations.php
36:             $dbr = wfGetDB( DB_SLAVE );

api/ApiQueryMessageCollection.php
180:            $dbr = wfGetDB( DB_SLAVE );

ttmserver/DatabaseTTMServer.php
21:      * @param $mode int DB_SLAVE|DB_MASTER
24:     protected function getDB( $mode = DB_SLAVE ) {
220:            $dbr = $this->getDB( DB_SLAVE );

MessageCollection.php
241:    public function loadTranslations( $dbtype = DB_SLAVE ) {
626:    protected function loadInfo( array $keys, $dbtype = DB_SLAVE ) {
656:    protected function loadReviewInfo( array $keys, $dbtype = DB_SLAVE ) {
686:    protected function loadData( array $keys, $dbtype = DB_SLAVE ) {

TranslateUtils.php
76:             $dbr = wfGetDB( DB_SLAVE );
114:            $dbr = wfGetDB( DB_SLAVE );

utils/RcFilter.php
36:             $dbr = wfGetDB( DB_SLAVE );

utils/TranslateMetadata.php
24:                     $dbr = wfGetDB( DB_SLAVE );

utils/MessageHandle.php
228:            $dbr = wfGetDB( DB_SLAVE );

utils/RevTag.php
26:                     $dbr = wfGetDB( DB_SLAVE );
87:                     $dbr = wfGetDB( DB_SLAVE );

utils/MessageIndex.php
324:            $dbr = wfGetDB( DB_SLAVE );
337:            $dbr = wfGetDB( DB_SLAVE );

tag/TPParse.php
136:            $db = wfGetDB( DB_SLAVE );

tag/TranslatablePage.php
573:    protected function getTag( $tag, $dbt = DB_SLAVE ) {