The alt text is read aloud when someone fills in a survey using a screen-reader. It is standard "Help"; which is slightly irritating when it is repeated with lots of wuestions.
So I want to change it to: nothing (i.e. silence), or something like "Information about this question:".

I tried changing the text Help inside the translation file, but that does not change anything.
The alt-text can be changed inside common.php.
Search for:
$line=str_replace("QUESTIONHELP", "<img src='$helpicon' alt='Help' align='left' />".$help, $line);

Change the text after alt=

Save the file and that is it.
You can find common.php in the root of your limesurvey install.

However: watch out when you update. This can cause your changes disappear.

Mazi thinks it would be useful to be able to also change these text by editing the translation, what do you think?!