Not sure that is necessary to change the English.ini - I was able to change it just selecting Custom via Text/Language within the Setup Wizard:
Next, I went to the menu items that I wanted to change:
Note that I modified "By Category" to display only "Category" within GameEx. I also deleted the text next to "By Genre."
The end result - "By Category" now reads as "Category" and there is no reference to "By Genre" in the menu bar:
Since my install is in English, my Custom is going to show English - not certain that it displays in German if the default German install is selected. Something Tom would probably know.
However, I did go into the German.ini file and deleted "Nach Genre" and no By Genre reference within the tool bar:
Now I do have to wonder if the language .ini files are altered, will they be overwritten by subsequent updates to GameEx? If so, will there be problems with making the language .ini files Read Only that will prevent GameEx from potentially updating correctly or crashing?