Add initial config with Polish translation

src/translations/pl-PL/conclusions/conclusion.md

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+---
+type: introduction
+page: conclusion
+locale: en-US
+---
+
+You know how you sometimes start tweaking a few lines of code here and there, then realize a couple functions could use some refactoring, and then one things leading to another you find yourself a few days later in the process of setting up a brand new stack complete with a database and GraphQL API?
+
+This is what happened to us this year. And while it resulted in quite a few stressful evenings as we tried to wrap this up and release the State of JavaScript 2019 results in, well, 2019; it also means we now have a much more powerful and flexible stack to collect and analyze data going forward.
+
+This will come in handy to analyze the evolution of all the new tools starting to make waves such as Svelte, Stencil, Sporky, Nest, or Flutter. And yes, I did just make up one of those five, but admit it: you had a moment of doubt didn’t you?
+
+But don’t worry. No matter how many weirdly-named libraries the community keeps throwing at you, we’ll be there to help make sense of all this chaos… that is, if we’re not too busy going through yet another refactoring to get our code just perfect!
+
+<span class="conclusion__byline">– Sacha & Raphaël</span>

src/translations/pl-PL/introductions/awards.md

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+---
+type: introduction
+page: awards
+locale: en-US
+---
+
+The world's most prestigious (and possibly only) JavaScript awards are back. Before you click, try guessing which technology took gold in each category!
+

src/translations/pl-PL/introductions/demographics.md

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+---
+type: introduction
+page: demographics
+locale: en-US
+---
+
+This year's State of JavaScript was the survey's fourth edition, and it reached 21,717 respondents. It was interesting to see that despite few people identifying as pure back-end developers, our respondents still feel quite comfortable dealing with development on the server.

src/translations/pl-PL/introductions/features/browser_apis.md

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+---
+type:   introduction
+page:   browser_apis
+locale: en-US
+---
+
+The features provided by the browser.

src/translations/pl-PL/introductions/features/data_structures.md

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+---
+type:   introduction
+page:   data_structures
+locale: en-US
+---
+
+How you store and manipulate data.

src/translations/pl-PL/introductions/features/features.md

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+---
+type: introduction
+page: features
+locale: en-US
+---
+
+One of the most exciting things about JavaScript as a language is that it's not standing still. From arrow functions to destructuring, many key features added over the past couple years are now an integral part of how we write JavaScript.
+
+So starting this year, in addition to which tools you use we're also tracking how you write JavaScript: the patterns, syntax, and features you use… or maybe don't use just yet but are definitely keeping an eye on!

src/translations/pl-PL/introductions/features/language.md

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+---
+type:   introduction
+page:   language
+locale: en-US
+---
+
+The vocabulary of JavaScript.

src/translations/pl-PL/introductions/features/other_features.md

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+---
+type:   introduction
+page:   other_features
+locale: en-US
+---
+
+Other technologies and patterns.

src/translations/pl-PL/introductions/features/syntax.md

@@ -0,0 +1,7 @@
+---
+type:   introduction
+page:   syntax
+locale: en-US
+---
+
+The grammar of JavaScript.

src/translations/pl-PL/introductions/introduction.md

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+---
+type: introduction
+page: introduction
+locale: en-US
+---
+
+<span class="first-letter">W</span>e were pretty sure 2018 would be the last time we did this survey. After all, the JavaScript ecosystem can’t very well keep changing *again*, can it?
+
+But what do you know, turns out JavaScript isn’t quite done changing just yet! And so after over 21,717 respondents took this year's survey we had to dig up our components and charts, curse us-from-a-year-ago for writing such crappy code, and get to work digging through the data. 
+
+We had some help though. The amazing [Amelia Wattenberger](http://wattenberger.com/) joined the team as a guest dataviz expert to contribute a fresh new look on our data, and you’ll be able to explore her work in the **Overview** section.
+
+We also borrowed a couple new visualisations from the State of JS's sister survey, the [State of CSS](https://2019.stateofcss.com/). We recommend checking it out if you haven’t done so yet!
+
+### Team
+
+The State of JavaScript Survey is created and maintained by:
+
+- [Sacha Greif](https://twitter.com/sachagreif) (me!): Design, writing, coding
+- [Raphaël Benitte](https://twitter.com/benitteraphael): Data analysis, data visualizations
+
+Be sure to check out my React/GraphQL JavaScript framework, [Vulcan.js](http://vulcanjs.org), as well as Raphaël's React data visualization library [nivo](https://nivo.rocks).
+
+### Download Our Data
+
+You can [download the raw JSON data for this survey](https://www.kaggle.com/sachag/state-of-js-2019). Let us know if you end up making your own data visualizations!
+
+### Completion Percentages
+
+Because all survey questions could be skipped, some questions ended up with fewer answers than others. So we've added a small pie chart indicator to each question to let you know which proportion of total respondents answered it.  
+
+### Credits & Stuff
+
+The site is set in IBM Plex Mono. Questions? Feedback? [Get in touch!](mailto:[email protected])
+
+And now, let's see what JavaScript has been up to this year!
+
+<span class="conclusion__byline">– Sacha and Raphaël</span>

src/translations/pl-PL/introductions/opinions.md

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+---
+type: introduction
+page: opinions
+locale: en-US
+---
+
+Sometimes the best way to take the pulse of a community is to just go ahead and ask. From your opinion about JavaScript's rate of change, to more thorny questions like whether JavaScript is moving in the right direction, you finally had a chance to tell us exactly what's on your mind!
+
+For each of the following statements, we asked you how much you agreed on a 5-point scale. 

src/translations/pl-PL/introductions/other-tools.md

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+---
+type: introduction
+page: other_tools
+locale: en-US
+---
+
+You always need a text editor to code, but the process of writing JavaScript also relies on browsers and devtools to a greater extent than probably any other language. 

src/translations/pl-PL/introductions/overview.md

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+---
+type: introduction
+page: overview
+locale: en-US
+---
+
+Before digging deep in the details, let's take a moment to take in a bigger-picture overview of the JavaScript ecosystem in 2019 courtesy of the talented [Amelia Wattenberger](https://wattenberger.com/), our guest data visualization expert!

src/translations/pl-PL/introductions/resources.md

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+---
+type: introduction
+page: resources
+locale: en-US
+# note: naming this file `resources.md` creates conflict with existing `resources.yml`
+---
+
+There's only so much you can figure out by yourself. At some point you need to put down the keyboard and take a moment to listen to your wise elders – or maybe just ask Google. 
+
+Whatever the case may be, we wanted to know which blogs, magazines, podcasts, and sites you relied on. 

src/translations/pl-PL/introductions/support.md

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+---
+type: introduction
+page: support
+locale: en-US
+---
+The State of JavaScript survey is a volunteer project, but in order to make the
+project sustainable we’re always looking for partners who can help support us,
+either financially or by helping us spread the word.
+
+If you think you could help in any way, please don’t hesitate to
+<a href="mailto:[email protected]">get in touch</a>!

src/translations/pl-PL/introductions/tools/back_end_frameworks.md

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+---
+type:   introduction
+page:   back_end_frameworks
+locale: en-US
+---
+
+JavaScript on the server.

src/translations/pl-PL/introductions/tools/data_layer.md

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+---
+type:   introduction
+page:   data_layer
+locale: en-US
+---
+
+Loading and managing data in your app.

src/translations/pl-PL/introductions/tools/front_end_frameworks.md

@@ -0,0 +1,7 @@
+---
+type:   introduction
+page:   front_end_frameworks
+locale: en-US
+---
+
+Front-end frameworks and libraries.

src/translations/pl-PL/introductions/tools/javascript_flavors.md

@@ -0,0 +1,7 @@
+---
+type:   introduction
+page:   javascript_flavors
+locale: en-US
+---
+
+Languages that compile to JavaScript

src/translations/pl-PL/introductions/tools/mobile_desktop.md

@@ -0,0 +1,7 @@
+---
+type:   introduction
+page:   mobile_desktop
+locale: en-US
+---
+
+JavaScript for mobile devices and desktop apps

src/translations/pl-PL/introductions/tools/testing.md

@@ -0,0 +1,7 @@
+---
+type:   introduction
+page:   testing
+locale: en-US
+---
+
+Tools for testing your code.

src/translations/pl-PL/introductions/tshirt.md

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+---
+type: introduction
+page: tshirt
+locale: en-US
+---
+
+## The State of JavaScript T-shirt: Support the survey and look good in the process!
+
+This year we're releasing our very own **👕 State of JavaScript T-shirt 👕** to finance our efforts!
+
+The shirt features a ”periodic table of JavaScript” that lists the most popular libraries grouped by category, along with their GitHub stars counts (in thousands).
+
+This shirt is a great way to familiarize yourself with the JavaScript ecosystem, and maybe even strike up a conversation with other like-minded JavaScript developers!