Delete the 3 files
in the directory where UltraEdit has it's ini-file uedit32.ini and then start UltraEdit. For new installations the ini-file should be in your personal application data directory, which is by default a hidden directory (turn on displaying hidden files and folders in Windows Explorer). For an English WinXP it is by default (but not on my computer)
C:\Document and Settings\YOUR USERNAME\Application Data\IDMComp\UltraEdit\
Also look into the Advanced.* and Basic.* text config files in the same directory, if they are with English texts. If not, close Ultraedit and delete it too and start again to let UltraEdit create it again in English.
Since UE v14 with it's multi-environment feature it is necessary to delete much more files to change the language. The files are again in the directory of the currently used INI - default path see above. The files to delete while UltraEdit is not running are: *.mb1 (menus) and *.pb1 (popup menus), maybe also *.te1 which contains language specific predefined templates. *.in1 contains environment specific INI settings which are not language dependent, *.tb1 contains the toolbars for an environment which are also not language dependent. But delete also *.in1, *.tb1 and *.te1 for an environment with a language specific file name. Per default following files are created by English UltraEdit v14 and later:
If there are "uedit32.??0" files like "uedit32.tb0" (exactly "ini-name.??0") you maybe need to delete these files too. Such files are present if you have a customized menu or toolbar saved with a different name to avoid changes on update as I have done for my preferred toolbar, but you have switched in the past at least once between existing default menus/toolbars and your customized menus/toolbars.
By the way: If you want to change the menu language without deletion of the profile files, just click with right mouse button into a free area of the menu and choose a different menu. Same can be done for toolbars.
The management (deletion/creation) of the menus and toolbars can be done also from within UltraEdit. Click with right mouse button into a free area of the menu or toolbar and choose Manage Menu/Toolbar Configurations or open Advanced - Configuration - Toolbars / Menus - Management and use the buttons Manage ... in this dialog. Complete environments can be managed (deleted/created/selected) at View - Environments.