Fixes #2 - Update help center articles

pages/adblockplus/add-a-language.md

Index: pages/adblockplus/add-a-language.md
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+title=Add a language
+description=Change the language that you normally browse websites in.
+template=article
+product_id=abp
+category=Customization & Settings
+
+You can enhance Adblock Plus by changing the language that you normally browse websites in.
+
+**Tip**: As a recommendation, you should avoid adding too many languages to Adblock Plus. Adding too many languages slows down the ad blocker and, therefore, your browsing.
+
+<section class="platform-chrome" markdown="1">
+## Chrome
+
+1. From the Chrome toolbar, click the **Adblock Plus** icon and select **Options**.
+<br>**Tip**: Refer to [this article](adblock-plus/hide-the-adblock-plus-icon.md) if you do not see the Adblock Plus icon.
+<br>The *Adblock Plus Settings* tab opens.
+2. From the *General* tab, scroll to the *Language* section.
+3. Do one of the following:
+    - Change the default browsing language by clicking **Change** and selecting a new language from the list.
+    - Add an additional browsing language by clicking **Add a language** and selecting a language from the list.
+4. Close the tab.
+</section>
+
+<section class="platform-firefox" markdown="1">
+## Firefox
+
+1. From the Firefox toolbar, click the **Adblock Plus** icon and select **Options**.
+<br>**Tip**: Refer to [this article](adblock-plus/hide-the-adblock-plus-icon.md) if you do not see the Adblock Plus icon.
+<br>The *Adblock Plus Settings* tab opens.
+2. From the *General* tab, scroll to the *Language* section.
+3. Do one of the following:
+    - Change the default browsing language by clicking **Change** and selecting a new language from the list.
+    - Add an additional browsing language by clicking **Add a language** and selecting a language from the list.
+4. Close the tab.
+</section>
+
+<section class="platform-opera" markdown="1">
+## Opera
+
+1. From the Opera toolbar, click the **Adblock Plus** icon and select **Options**.
+<br>**Tip**: Refer to [this article](adblock-plus/hide-the-adblock-plus-icon.md) if you do not see the Adblock Plus icon.
+<br>The *Adblock Plus Settings* tab opens.
+2. From the *General* tab, scroll to the *Language* section.
+3. Do one of the following:
+    - Change the default browsing language by clicking **Change** and selecting a new language from the list.
+    - Add an additional browsing language by clicking **Add a language** and selecting a language from the list.
+4. Close the tab.
+</section>