typo fix.

docs/guide/i18n.md

@@ -47,7 +47,7 @@ translation of the message from source language into target language. Message it
 echo \Yii::t('app', 'This is a string to translate!');
 ```
 
-Yii tries to load approprite translation from one of the message sources defined via `i18n` component configuration:
+Yii tries to load appropriate translation from one of the message sources defined via `i18n` component configuration:
 
 ```php
 'components' => [
@@ -239,7 +239,7 @@ you'll get "Inconsistent types declared for an argument: U_ARGUMENT_TYPE_MISMATC
 Total {count, number} {count, plural, one{item} other{items}}.
 ```
 
-To learn which inflection forms you should specify for your language you can referer to
+To learn which inflection forms you should specify for your language you can referrer to
 [rules reference at unicode.org](http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html).
 
 ### Selections
@@ -265,4 +265,4 @@ Formatters
 In order to use formatters you need to install and enable [intl](http://www.php.net/manual/en/intro.intl.php) PHP
 extension.
 
-TBD: provided classes overview.
+TBD: provided classes overview.