To make a like button have one like per device, you'll need to use some form of device fingerprinting. A device fingerprint is a unique identifier that can be generated from device characteristics, such as the user agent string, screen resolution, and installed fonts, among others.

You can use a library like fingerprintjs2 to generate a device fingerprint in JavaScript. Once you have the fingerprint, you can store it in a cookie or localStorage and check it when the user clicks the like button. If the fingerprint is already stored, you can prevent the user from liking again.

Here's some code using fingerprintjs2:

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// Load the fingerprintjs2 library
const Fingerprint2 = require('fingerprintjs2');

// Generate the device fingerprint
const fingerprint = new Promise(resolve => {
  Fingerprint2.get(function(components) {
    const values = components.map(component => component.value);
    const fingerprint = Fingerprint2.x64hash128(values.join(''), 31);
    resolve(fingerprint);
  });
});

// When the like button is clicked, check if the fingerprint is already stored
const likeButton = document.querySelector('#like-button');
likeButton.addEventListener('click', async () => {
  const fingerprintValue = await fingerprint;
  if (localStorage.getItem('fingerprint') === fingerprintValue) {
    alert('You can only like once per device!');
  } else {
    // Do the liking action
    localStorage.setItem('fingerprint', fingerprintValue);
  }
});

Keep in mind that device fingerprinting is not foolproof and can be circumvented in some cases, such as when users clear their cookies or use browser extensions that modify their user agent string.

You can create a button that will change language on your website using JavaScript. On HTML you will need to create a button element:

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<button id="btn">Change Language</button>

Then add an onclick instruction inside the button element in the HTML:

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<button id="btn" onclick="changeLang()">Change Language</button>

You will also need to add a JavaScript function to set the language of the page. For example, the following code will create a variable to hold the language and then checks if the language variable is set to en or es and changes the language accordingly:

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function changeLang() {
    var language = getCookie("lang");
    if (test == "en") {
        setCookie("lang", "es", 365);
        window.location.reload();
    } else {
        setCookie("lang", "en", 365);
        window.location.reload();
    }    
}

You can get more information and a more detailed explanation in this article: How to Add a Language Switcher to Your Site

Good luck!

Cookies can be used in JavaScript to store user information. To use them, you'll first have to create the cookie on the server side and then use the JavaScript document.cookie property to get, set, and delete the cookie.

To set a cookie in JavaScript, you can use the document.cookie property like this:

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document.cookie = "name=value;expires=date";

To get the cookie, use the following code:

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var name = document.cookie.split('=')[0];

To delete the cookie, use the following code:

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document.cookie = "name=; expires=Thu, 01 Jan 1970 00:00:00 UTC";

For more information on how to use cookies in JavaScript, check out this tutorial.