WARSAW — Polish language experts launched a campaign Thursday to preserve the challenging system of its diacritical marks, saying the tails, dots, and strokes are becoming obsolete under the pressure of IT and speed.

The drive, initiated by the state-run Council of the Polish Language, is part of the ­UNESCO International Mother Language Day. The campaign’s Polish name is complicated for a non-Polish keyboard: ‘‘Je,zyk polski jest a,-e,.’’