Update documentation

docs/4devs.md

@@ -30,3 +30,26 @@ For _very_ rough statistics, open devTools -> Network and look at the line that
 ## Subscriptions and queries
 
 For the performance of the app, it is important that we limit the amount of queries and subscriptions that alchemy creates when loading a page.
+
+## Coding conventions
+
+- As an ongoing process of adopting language localization, any new static text should be added to a translation file and used via `i18next` internationalization-framework.
+Translation files location is under `src/assets/locales/`. After adding your text just import `i18next` and use the translation function:
+
+  `src/assets/locales/en/translation.json`
+
+  ```
+  {
+    "My text key" : "Lorem ipsum dolor sit amet"
+  }
+  ```
+
+  Your code:
+
+  ```
+  import i18next from "i18next";
+
+  i18next.t("My text key"")}
+  ```
+- Use global variables for styling. See `src/assets/styles/global-variables.scss`.
+We aim to stick to a uniform variables palette so add a new one only if it's necessary.