Fixes for inconsistencies in Crowdin. Also slight wording changes for the conditional tests to make them consistent. (#1262)

Author: sspencerwire

docs/books/learning_bash/07-loops.md

@@ -39,9 +39,21 @@ Whatever the loop used, the commands to be repeated are placed **between the wor
 
 The `while` / `do` / `done` structure evaluates the command placed after `while`.
 
-If this command is true (`$? = 0`), the commands placed between `do` and `done` are executed. The script then returns to the beginning to evaluate the command again.
+When the evaluated command is true:
 
-When the evaluated command is false (`$? != 0`), the shell resumes the execution of the script at the first command after done.
+```
+$? = 0
+```
+
+the commands placed between `do` and `done` are executed. The script then returns to the beginning to evaluate the command again.
+
+When the evaluated command is false:
+
+```
+$? != 0
+```
+
+the shell resumes the execution of the script at the first command after done.
 
 Syntax of the conditional loop structure `while`:
 
@@ -140,7 +152,13 @@ done
 
 The `until` / `do` / `done` structure evaluates the command placed after `until`.
 
-If this command is false (`$? != 0`), the commands placed between `do` and `done` are executed. The script then returns to the beginning to evaluate the command again.
+When the evaluated command is false:
+
+```
+$? != 0
+```
+
+the commands placed between `do` and `done` are executed. The script then returns to the beginning to evaluate the command again.
 
 When the evaluated command is true (`$? = 0`), the shell resumes the execution of the script at the first command after `done`.