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Is your feature request related to a problem? Please describe.
Currently, the spell checker defaults to the system's language on Linux. In my case this is German. However, I mostly communicate in English on Talk and the spell checker constantly shows the red underline below each word because it doesn't understand English.

Describe the solution you'd like
Let users configure languages used for spell checking.

Describe alternatives you've considered
Change my system's language. This won't fix the issue as I'm communication both in German and English regularly in Talk.

Additional context
Here is a hack I'm currently using that works:

diff --git a/src/talk/talk.window.js b/src/talk/talk.window.js
index 6d69246..680847b 100644
--- a/src/talk/talk.window.js
+++ b/src/talk/talk.window.js
@@ -67,6 +67,9 @@ function createTalkWindow() {
        applyWheelZoom(window)
        setupTray(window)

+       // Configure the spell checker to use English (US) and German
+       window.webContents.session.setSpellCheckerLanguages(['en-US', 'de'])
+
        window.loadURL(TALK_WINDOW_WEBPACK_ENTRY)

        return window