[Glitch] Spell check input fields

Port 67744ee779 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/compose/components/compose_form.js

@@ -332,6 +332,7 @@ class ComposeForm extends ImmutablePureComponent {
             className='spoiler-input__input'
             lang={this.props.lang}
             autoFocus={false}
+            spellCheck
           />
         </div>
 

app/javascript/flavours/glitch/features/compose/components/poll_form.js

@@ -72,6 +72,7 @@ class Option extends React.PureComponent {
             maxLength={pollLimits.max_option_chars}
             value={title}
             lang={lang}
+            spellCheck
             onChange={this.handleOptionTitleChange}
             suggestions={this.props.suggestions}
             onSuggestionsFetchRequested={this.onSuggestionsFetchRequested}