"Members" under Tools topbar menu does not get translated

Hi, I am new to Elgg so have no idea whether this is my own fault or not. I have installed Traditional Chinese language support for all the plugins (using "elgg_zh_tw_1.7" downloaded from the community). Everything seems to work now, except that the "Members" word under the Tools topbar menu does not change no matter what I do. The other plugins have no such problem.

Please let me have some idea what I could have done wrong. Thanks ! Elgg and Elgg Community is great!