module cuts titles or content after special characters

I experience this problem too. It happens after these accent characters such as 'é' as well as at umlauts as in "ü".

I think this problem is related to character encoding. I was able to get the data to import correctly when it was saved in utf-8 format. utf-16 didn't work, nor did the default Excel CSV format output.

You should always try and use UTF-8 as your default text format for importing into Drupal, as all its tables are UTF-8. So, when preparing your data, ensure that the text editor you use is saving the files in UTF-8 (without BOM if you have that option). Excel has some issues with UTF-8 and I would recommend that you rather use OpenOffice for this. When saving CSV files in OpenOffice, you get the option for selecting not only the delimiters and separators, but also what text encoding to use - select Unicode (UTF-8) here. I've had those little trademark and registered symbols in node titles, and if I don't do this, they all get cut at that symbol.

So I wouldn't call this a bug - its actually a file format error on the user's side. Changing tags to reflect this.

Did you try node_import-5.x-1.5 ?

I can confirm this. Importing Chinese dictionary data, all UTF-8. Standard line has many diacritics in transliteration field. Sample entry:
"安靜","ānjìng","calm". It imports fine.