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for login "Login" and "Sign up". you can make new language overrides from joomla backend > extensions > language manager > overrides
and create new overrides for the following language string
MOD_COMMUNITY_LOGIN
MOD_COMMUNITY_SIGN_UP
and for "Search", copy default.php from /modules/mod_community_toolbar/tmpl/ to /templates/socialize/html/mod_community_toolbar/ (create the folder if not exit)
edit that file, at line 60: