https://www.vivicracovia.it/modules/mod_addsearch/assets/js/stripDiacritics.js?1

1String.prototype.stripDiacritics=function(){for(var e=[{base:"A",letters:"AⒶＡÀÁÂẦẤẪẨÃĀĂẰẮẴẲȦÇ ÄǞẢÅǺǍȀȂẠẬẶḀĄȺⱯ"},{base:"AA",letters:"Ꜳ"},{base:"AE",letters:"ÆǼǢ"},{base:"AO",letters:"Ꜵ"},{base:"AU",letters:"Ꜷ"},{base:"AV",letters:"ꜸꜺ"},{base:"AY",letters:"Ꜽ"},{base:"B",letters:"BⒷＢḂḄḆɃƂƁ"},{base:"C",letters:"CⒸＣĆĈĊČÇḈƇȻꜾ"},{base:"D",letters:"DⒹＤḊĎḌḐḒḎĐƋƊƉꝹ"},{base:"DZ",letters:"DZDŽ"},{base:"Dz",letters:"DzDž"},{base:"E",letters:"EⒺＥÈÉÊỀẾỄỂẼĒḔḖĔĖËẺĚȄȆẸỆȨḜĘḘḚƐƎ"},{base:"F",letters:"FⒻＦḞƑꝻ"},{base:"G",letters:"GⒼＧǴĜá¸ ÄžÄ ǦĢǤƓêž ꝽꝾ"},{base:"H",letters:"HⒽＨĤḢḦȞḤḨḪĦⱧⱵꞍ"},{base:"I",letters:"IⒾＩÌÍÎĨĪĬİÏḮỈǏȈȊỊĮḬƗ"},{base:"J",letters:"JⒿＪĴɈ"},{base:"K",letters:"KⓀＫḰǨḲĶḴƘⱩꝀꝂꝄꞢ"},{base:"L",letters:"LⓁＬĿĹĽḶḸĻḼḺŁȽⱢâ± ꝈꝆꞀ"},{base:"LJ",letters:"LJ"},{base:"Lj",letters:"Lj"},{base:"M",letters:"MⓂＭḾṀṂⱮƜ"},{base:"N",letters:"NⓃＮǸŃÑṄŇṆŅṊṈÈ ƝꞐꞤ"},{base:"NJ",letters:"ÇŠ"},{base:"Nj",letters:"Ç‹"},{base:"O",letters:"OⓄＯÒÓÔỒỐỖỔÕṌȬṎŌṐṒŎȮȰÖȪỎŐǑȌȎÆ ỜỚá» ỞỢỌỘǪǬØǾƆƟꝊꝌ"},{base:"OI",letters:"Æ¢"},{base:"OO",letters:"Ꝏ"},{base:"OU",letters:"È¢"},{base:"OE",letters:"ŒŒ"},{base:"oe",letters:"œœ"},{base:"P",letters:"PⓅＰṔṖƤⱣꝐꝒꝔ"},{base:"Q",letters:"QⓆＱꝖꝘɊ"},{base:"R",letters:"RⓇＲŔṘŘȐȒṚṜŖṞɌⱤꝚꞦꞂ"},{base:"S",letters:"SⓈＳẞŚṤŜá¹ Å ṦṢṨȘŞⱾꞨꞄ"},{base:"T",letters:"TⓉＴṪŤṬȚŢṰṮŦƬƮȾꞆ"},{base:"TZ",letters:"Ꜩ"},{base:"U",letters:"UⓊＵÙÚÛŨṸŪṺŬÜǛǗǕǙỦŮŰǓȔȖƯỪỨỮỬỰỤṲŲṶṴɄ"},{base:"V",letters:"VⓋＶṼṾƲꝞɅ"},{base:"VY",letters:"ê "},{base:"W",letters:"WⓌＷẀẂŴẆẄẈⱲ"},{base:"X",letters:"XⓍＸẊẌ"},{base:"Y",letters:"YⓎＹỲÝŶỸȲẎŸỶỴƳɎỾ"},{base:"Z",letters:"ZⓏＺŹẐŻŽẒẔƵȤⱿⱫꝢ"},{base:"a",letters:"aⓐａẚà áâầấẫẩãāăằắẵẳȧǡäǟảåǻǎȁȃạậặḁąⱥɐ"},{base:"aa",letters:"ꜳ"},{base:"ae",letters:"æǽǣ"},{base:"ao",letters:"ꜵ"},{base:"au",letters:"ꜷ"},{base:"av",letters:"ꜹꜻ"},{base:"ay",letters:"ꜽ"},{base:"b",letters:"bⓑｂḃḅḇƀƃɓ"},{base:"c",letters:"cⓒｃćĉċčçḉƈȼꜿↄ"},{base:"d",letters:"dⓓｄḋďḍḑḓḏđƌɖɗꝺ"},{base:"dz",letters:"dzdž"},{base:"e",letters:"eⓔｅèéêềếễểẽēḕḗĕėëẻěȅȇẹệȩḝęḙḛɇɛǝ"},{base:"f",letters:"fⓕｆḟƒꝼ"},{base:"g",letters:"gⓖｇǵĝḡğġǧģǥÉ ꞡᵹꝿ"},{base:"h",letters:"hⓗｈĥḣḧȟḥḩḫẖħⱨⱶɥ"},{base:"hv",letters:"Æ•"},{base:"i",letters:"iⓘｉìíîĩīĭïḯỉǐȉȋịįḭɨı"},{base:"j",letters:"jⓙｊĵǰɉ"},{base:"k",letters:"kⓚｋḱǩḳķḵƙⱪꝁꝃꝅꞣ"},{base:"l",letters:"lⓛｌŀĺľḷḹļḽḻſłƚɫⱡꝉꞁꝇ"},{base:"lj",letters:"lj"},{base:"m",letters:"mⓜｍḿṁṃɱɯ"},{base:"n",letters:"nⓝｎǹńñṅňṇņṋṉƞɲʼnꞑꞥ"},{base:"nj",letters:"ÇŒ"},{base:"o",letters:"oⓞｏòóôồốỗổõṍȭṏōṑṓŏȯȱöȫỏőǒȍȏơờớỡởợọộǫǭøǿɔꝋꝍɵ"},{base:"oi",letters:"Æ£"},{base:"ou",letters:"È£"},{base:"oo",letters:"ꝏ"},{base:"p",letters:"pⓟｐṕṗƥᵽꝑꝓꝕ"},{base:"q",letters:"qâ“ ｑɋꝗꝙ"},{base:"r",letters:"rⓡｒŕṙřȑȓṛṝŗṟɍɽꝛꞧꞃ"},{base:"s",letters:"sⓢｓßśṥŝṡšṧṣṩșşȿꞩꞅẛ"},{base:"t",letters:"tⓣｔṫẗťṭțţṱṯÃ

1…§Æ­Êˆâ±¦êž‡"},{base:"tz",letters:"ꜩ"},{base:"u",letters:"uⓤｕùúûũṹūṻŭüǜǘǖǚủůűǔȕȗưừứữửựụṳųṷṵʉ"},{base:"v",letters:"vⓥｖṽṿʋꝟʌ"},{base:"vy",letters:"ꝡ"},{base:"w",letters:"wⓦｗẁẃŵẇẅẘẉⱳ"},{base:"x",letters:"xⓧｘẋẍ"},{base:"y",letters:"yⓨｙỳýŷỹȳẏÿỷẙỵƴɏỿ"},{base:"z",letters:"zⓩｚźẑżžẓẕƶȥɀⱬꝣ"}],t={},s=0;s<e.length;s++)for(var r=e[s].letters,a=0;a<r.length;a++)t[r[a]]=e[s].base;return this.replace(/[^\u0000-\u007E]/g,function(e){return t[e]||e})};