Simple texts can be modified in the Texts window.

Clear resets a string to an empty value. Remove erases the entry from the mod, possibly revealing previous values (if the engine is modding-capable).

When displaying a text, there might be various entries with many question marks ('?'). If you copy the text to the clipboard, and then to a capable editor, these characters might be displayed as control characters.

These are interpreted by the engine as possible break points for words, should it want to fit more into a line when displaying. It seems like this is an underused feature of the engine, as not all language translations make use of this.

When you set a new text, you don't have to consider these breaking points, and simply use text as-is.