how to use jQuery to convert html page content into another language and consider special characters?

I have a jquery code that I use to convert/translate page content.

this works fine but some of the texts on my page has special characters or extra .(dots).

and this causes an issue in my code and the translation fails.

here's the complete code:

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

(function($){
$.fn.translate = function(options) {
var that = this; //a reference to ourselves
var settings = {
css: "trn",
lang: "en"/*,
t: {
"translate": {
pt: "tradução",
br: "tradução"
}
}*/
};
settings = $.extend(settings, options || {});
if (settings.css.lastIndexOf(".", 0) !== 0)   //doesn't start with '.'
settings.css = "." + settings.css;
var t = settings.t;
//public methods
this.lang = function(l) {
if (l) {
settings.lang = l;
this.translate(settings);  //translate everything
}
return settings.lang;
};
this.get = function(index) {
var res = index;
try {
res = t[index][settings.lang];
}
catch (err) {
//not found, return index
return index;
}
if (res)
return res;
else
return index;
};
this.g = this.get;
// for inputs. for any attributes. like in this example i am translating placeholder.
// you can translate any tooltip or any other attribute
for (var i = 0; i < $(".trn").get().length; i++) {
if ($(".trn").get()[i].nodeName == "INPUT") {
var thisNode = $($(".trn").get()[i]);
var placeholderValue = thisNode.attr("placeholder");
var trn_key = thisNode.attr("data-trn-key");
if (!trn_key) {
trn_key = placeholderValue;
thisNode.attr("data-trn-key", trn_key);   //store key for next time
}
thisNode.attr("placeholder", t[trn_key][settings.lang]);
}
}    
//main
this.find(settings.css).each(function(i) {
var $this = $(this);
var trn_key = $this.attr("data-trn-key");
if (!trn_key) {
trn_key = $this.html();
$this.attr("data-trn-key", trn_key);   //store key for next time
}
$this.html(that.get(trn_key));
});
return this;
};
})(jQuery);
///WE USE THE FUNCTION HERE
var dict = {
"Task": {
ge: "Aufgabe"
}
}
var translator = $(document).translate({lang: "en", t: dict});
translator.lang("ge");

<!-- language: lang-html -->

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<span class="trn">Task</span><br>
<span class="trn">Task:</span><br>
<span class="trn">Task...</span>

<!-- end snippet -->

if you run the above code, you'll see that the only text that gets translated is the first one (Task) which doesn't have any other characters or dots.

How can I ignore all the special characters and the dots etc and just translate the words?

I tried something like this which doesn't work:

trn_key = trn_key.replace(':', ' ');

Use regex to replace special character with empty string and use that string to translate. Similarly, hold the special character if you need to be displayed along with translated word. In this case I have used

trn_key.replace(/[`~!@#$%^&*()_|+\-=?;:'",.<>\{\}\[\]\\\/]/gi, '');

to replace special character taken from https://stackoverflow.com/a/11090301/5740382

Following is the working example:

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

(function($){
$.fn.translate = function(options) {
var that = this; //a reference to ourselves
var settings = {
css: "trn",
lang: "en"/*,
t: {
"translate": {
pt: "tradução",
br: "tradução"
}
}*/
};
settings = $.extend(settings, options || {});
if (settings.css.lastIndexOf(".", 0) !== 0)   //doesn't start with '.'
settings.css = "." + settings.css;
var t = settings.t;
//public methods
this.lang = function(l) {
if (l) {
settings.lang = l;
this.translate(settings);  //translate everything
}
return settings.lang;
};
this.get = function(index) {
var res = index;
try {
res = t[index][settings.lang];
}
catch (err) {
//not found, return index
return index;
}
if (res)
return res;
else
return index;
};
this.g = this.get;
// for inputs. for any attributes. like in this example i am translating placeholder.
// you can translate any tooltip or any other attribute
for (var i = 0; i < $(".trn").get().length; i++) {
if ($(".trn").get()[i].nodeName == "INPUT") {
var thisNode = $($(".trn").get()[i]);
var placeholderValue = thisNode.attr("placeholder");
var trn_key = thisNode.attr("data-trn-key");
if (!trn_key) {
trn_key = placeholderValue;
thisNode.attr("data-trn-key", trn_key);   //store key for next time
}
thisNode.attr("placeholder", t[trn_key][settings.lang]);
}
}    
//main
this.find(settings.css).each(function(i) {
var $this = $(this);
var trn_key = $this.attr("data-trn-key");
if (!trn_key) {
trn_key = $this.html();
$this.attr("data-trn-key", trn_key);   //store key for next time
}
let currentWord = trn_key.replace(/[`~!@#$%^&*()_|+\-=?;:'",.<>\{\}\[\]\\\/]/gi, '');
let currentSpecialCharacter = trn_key.replace(currentWord, '');
$this.html(that.get(currentWord) + currentSpecialCharacter);
});
return this;
};
})(jQuery);
///WE USE THE FUNCTION HERE
var dict = {
"Task": {
ge: "Aufgabe"
}
}
var translator = $(document).translate({lang: "en", t: dict});
translator.lang("ge");

<!-- language: lang-html -->

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<span class="trn">Task</span><br>
<span class="trn">Task:</span><br>
<span class="trn">Task...</span>

<!-- end snippet -->

You can remove them from the lookup key

Add the chars you want or reverse something like /^[\p{L}]+$/u

this.get = function(index) {
var res = index;
var clean = index.replace(/[\.:\?]/g,""); // added - 
try {
res = t[clean][settings.lang]; // changed
}
catch (err) {
//not found, return index
return index;
}
if (res)
return index.split(clean).join(res); // changed
else
return index;
};

<!-- begin snippet: js hide: trueconsole: true babel: false -->

<!-- language: lang-js -->

(function($){
$.fn.translate = function(options) {
var that = this; //a reference to ourselves
var settings = {
css: "trn",
lang: "en"/*,
t: {
"translate": {
pt: "tradução",
br: "tradução"
}
}*/
};
settings = $.extend(settings, options || {});
if (settings.css.lastIndexOf(".", 0) !== 0)   //doesn't start with '.'
settings.css = "." + settings.css;
var t = settings.t;
//public methods
this.lang = function(l) {
if (l) {
settings.lang = l;
this.translate(settings);  //translate everything
}
return settings.lang;
};
this.get = function(index) {
var res = index;
var clean = index.replace(/[\.:\?]/g,"");
try {
res = t[clean][settings.lang];
}
catch (err) {
//not found, return index
return index;
}
if (res)
return index.split(clean).join(res)
else
return index;
};
this.g = this.get;
// for inputs. for any attributes. like in this example i am translating placeholder.
// you can translate any tooltip or any other attribute
for (var i = 0; i < $(".trn").get().length; i++) {
if ($(".trn").get()[i].nodeName == "INPUT") {
var thisNode = $($(".trn").get()[i]);
var placeholderValue = thisNode.attr("placeholder");
var trn_key = thisNode.attr("data-trn-key");
if (!trn_key) {
trn_key = placeholderValue;
thisNode.attr("data-trn-key", trn_key);   //store key for next time
}
thisNode.attr("placeholder", t[trn_key][settings.lang]);
}
}    
//main
this.find(settings.css).each(function(i) {
var $this = $(this);
var trn_key = $this.attr("data-trn-key");
if (!trn_key) {
trn_key = $this.html();
$this.attr("data-trn-key", trn_key);   //store key for next time
}
$this.html(that.get(trn_key));
});
return this;
};
})(jQuery);
///WE USE THE FUNCTION HERE
var dict = {
"Task": {
ge: "Aufgabe"
}
}
var translator = $(document).translate({lang: "en", t: dict});
translator.lang("ge");

<!-- language: lang-html -->

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<span class="trn">Task</span><br>
<span class="trn">Task:</span><br>
<span class="trn">Task...</span>

<!-- end snippet -->