Update translations guidelines (#1135)

Author: cmonfortep

TRANSLATIONS.md

@@ -3,6 +3,8 @@ Thank you for taking the time to contribute to DuckDuckGo! :sparkles:
 
 If you know any of the following languages and would like to help us improve the translations for them, please follow the instructions below.
 
+⚠️ We only accept translations tweaks that fix actual issues (typos, grammatical errors) and won't accept minor changes that are only focused on tweaking the wording.
+
 ## List of languages
 1. Bulgarian (bg)
 1. Croatian (hr)
@@ -34,7 +36,7 @@ If you know any of the following languages and would like to help us improve the
 1. Each language has a [`values`](https://github.com/duckduckgo/Android/tree/develop/app/src/main/res) directory containing the language code, and the `strings.xml` file contains the translations. Examples:
     - Italian translation files are located within `app/src/main/res/values-it/strings.xml`  
     - Spanish translation files are located within `app/src/main/res/values-es/strings.xml`
-1. If you notice anything which could be improved, you should create a PR containing the improved language suggestions.
+1. If you notice anything which should be fixed, you should create a PR containing the improved language suggestions.
     1. Make the changes to the relevant `strings.xml` file
     1. Test the app in the language you've improved, and ensure the changed strings look good
     1. Create a PR. As well as the changes themselves, explaining _why_ the changes are an improvement helps a lot.