diff --git a/Behavioral/Observer/README.rst b/Behavioral/Observer/README.rst
index 53398c2..b6c47dc 100644
--- a/Behavioral/Observer/README.rst
+++ b/Behavioral/Observer/README.rst
@@ -5,7 +5,7 @@ Purpose
 -------
 
 To implement a publish/subscribe behaviour to an object, whenever a
-"Subject" object changes it's state, the attached "Observers" will be
+"Subject" object changes its state, the attached "Observers" will be
 notified. It is used to shorten the amount of coupled objects and uses
 loose coupling instead.
 
@@ -55,4 +55,4 @@ Tests/ObserverTest.php
    :linenos:
 
 .. _`GitHub`: https://github.com/domnikl/DesignPatternsPHP/tree/master/Behavioral/Observer
-.. __: http://en.wikipedia.org/wiki/Observer_pattern
\ No newline at end of file
+.. __: http://en.wikipedia.org/wiki/Observer_pattern
diff --git a/locale/ca/LC_MESSAGES/Behavioral/Observer/README.po b/locale/ca/LC_MESSAGES/Behavioral/Observer/README.po
index 6aea8e9..5119740 100644
--- a/locale/ca/LC_MESSAGES/Behavioral/Observer/README.po
+++ b/locale/ca/LC_MESSAGES/Behavioral/Observer/README.po
@@ -1,4 +1,4 @@
-# 
+#
 msgid ""
 msgstr ""
 "Project-Id-Version: DesignPatternsPHP 1.0\n"
@@ -22,7 +22,7 @@ msgstr ""
 #: ../../Behavioral/Observer/README.rst:7
 msgid ""
 "To implement a publish/subscribe behaviour to an object, whenever a "
-"\"Subject\" object changes it's state, the attached \"Observers\" will be "
+"\"Subject\" object changes its state, the attached \"Observers\" will be "
 "notified. It is used to shorten the amount of coupled objects and uses loose"
 " coupling instead."
 msgstr ""
diff --git a/locale/de/LC_MESSAGES/Behavioral/Observer/README.po b/locale/de/LC_MESSAGES/Behavioral/Observer/README.po
index c373b7d..d0d3767 100644
--- a/locale/de/LC_MESSAGES/Behavioral/Observer/README.po
+++ b/locale/de/LC_MESSAGES/Behavioral/Observer/README.po
@@ -23,7 +23,7 @@ msgstr "Zweck"
 
 #: ../../Behavioral/Observer/README.rst:7
 msgid ""
-"To implement a publish/subscribe behaviour to an object, whenever a \"Subject\" object changes it's "
+"To implement a publish/subscribe behaviour to an object, whenever a \"Subject\" object changes its "
 "state, the attached \"Observers\" will be notified. It is used to shorten the amount of coupled objects "
 "and uses loose coupling instead."
 msgstr ""
diff --git a/locale/es/LC_MESSAGES/Behavioral/Observer/README.po b/locale/es/LC_MESSAGES/Behavioral/Observer/README.po
index 6aea8e9..5119740 100644
--- a/locale/es/LC_MESSAGES/Behavioral/Observer/README.po
+++ b/locale/es/LC_MESSAGES/Behavioral/Observer/README.po
@@ -1,4 +1,4 @@
-# 
+#
 msgid ""
 msgstr ""
 "Project-Id-Version: DesignPatternsPHP 1.0\n"
@@ -22,7 +22,7 @@ msgstr ""
 #: ../../Behavioral/Observer/README.rst:7
 msgid ""
 "To implement a publish/subscribe behaviour to an object, whenever a "
-"\"Subject\" object changes it's state, the attached \"Observers\" will be "
+"\"Subject\" object changes its state, the attached \"Observers\" will be "
 "notified. It is used to shorten the amount of coupled objects and uses loose"
 " coupling instead."
 msgstr ""
diff --git a/locale/pt_BR/LC_MESSAGES/Behavioral/Observer/README.po b/locale/pt_BR/LC_MESSAGES/Behavioral/Observer/README.po
index 6aea8e9..5119740 100644
--- a/locale/pt_BR/LC_MESSAGES/Behavioral/Observer/README.po
+++ b/locale/pt_BR/LC_MESSAGES/Behavioral/Observer/README.po
@@ -1,4 +1,4 @@
-# 
+#
 msgid ""
 msgstr ""
 "Project-Id-Version: DesignPatternsPHP 1.0\n"
@@ -22,7 +22,7 @@ msgstr ""
 #: ../../Behavioral/Observer/README.rst:7
 msgid ""
 "To implement a publish/subscribe behaviour to an object, whenever a "
-"\"Subject\" object changes it's state, the attached \"Observers\" will be "
+"\"Subject\" object changes its state, the attached \"Observers\" will be "
 "notified. It is used to shorten the amount of coupled objects and uses loose"
 " coupling instead."
 msgstr ""
diff --git a/locale/ru/LC_MESSAGES/Behavioral/Observer/README.po b/locale/ru/LC_MESSAGES/Behavioral/Observer/README.po
index fbd4f45..f21467d 100644
--- a/locale/ru/LC_MESSAGES/Behavioral/Observer/README.po
+++ b/locale/ru/LC_MESSAGES/Behavioral/Observer/README.po
@@ -22,7 +22,7 @@ msgstr "Назначение"
 #: ../../Behavioral/Observer/README.rst:7
 msgid ""
 "To implement a publish/subscribe behaviour to an object, whenever a "
-"\"Subject\" object changes it's state, the attached \"Observers\" will be "
+"\"Subject\" object changes its state, the attached \"Observers\" will be "
 "notified. It is used to shorten the amount of coupled objects and uses loose"
 " coupling instead."
 msgstr ""
diff --git a/locale/zh_CN/LC_MESSAGES/Behavioral/Observer/README.po b/locale/zh_CN/LC_MESSAGES/Behavioral/Observer/README.po
index 6aea8e9..5119740 100644
--- a/locale/zh_CN/LC_MESSAGES/Behavioral/Observer/README.po
+++ b/locale/zh_CN/LC_MESSAGES/Behavioral/Observer/README.po
@@ -1,4 +1,4 @@
-# 
+#
 msgid ""
 msgstr ""
 "Project-Id-Version: DesignPatternsPHP 1.0\n"
@@ -22,7 +22,7 @@ msgstr ""
 #: ../../Behavioral/Observer/README.rst:7
 msgid ""
 "To implement a publish/subscribe behaviour to an object, whenever a "
-"\"Subject\" object changes it's state, the attached \"Observers\" will be "
+"\"Subject\" object changes its state, the attached \"Observers\" will be "
 "notified. It is used to shorten the amount of coupled objects and uses loose"
 " coupling instead."
 msgstr ""