Remove copied names from frontmatter

pl/bf.md

@@ -1,6 +1,5 @@
 ---
 category: language
-language: BF
 filename: learnbf-pl.bf
 contributors:
     - ["Prajit Ramachandran", "http://prajitr.github.io/"]

pl/haskell.md

@@ -1,7 +1,6 @@
 ---
 category: language
 filename: haskell-pl.hs
-language: Haskell
 contributors:
     - ["Adit Bhargava", "http://adit.io"]
 translators:

pl/java.md

@@ -1,5 +1,4 @@
 ---
-language: Java
 filename: LearnJavaPl.java
 contributors:
     - ["Jake Prather", "https://github.com/JakeHP"]

pl/json.md

@@ -1,6 +1,5 @@
 ---
 category: language
-language: JSON
 contributors:
   - ["Anna Harren", "https://github.com/iirelu"]
   - ["Marco Scannadinari", "https://github.com/marcoms"]

pl/perl.md

@@ -1,6 +1,5 @@
 ---
 category: language
-language: Perl
 filename: learnperl-pl.pm
 contributors:
     - ["Korjavin Ivan", "http://github.com/korjavin"]

pl/pythonlegacy.md

@@ -1,5 +1,4 @@
 ---
-language: Python 2 (legacy)
 filename: learnpythonlegacy-pl.py
 contributors:
     - ["Louie Dinh", "http://ldinh.ca"]

pl/ruby.md

@@ -1,5 +1,4 @@
 ---
-language: Ruby
 filename: learnruby-pl.rb
 contributors:
   - ["David Underwood", "http://theflyingdeveloper.com"]

pl/vim.md

@@ -1,6 +1,5 @@
 ---
 category: tool
-tool: Vim
 contributors:
     - ["RadhikaG", "https://github.com/RadhikaG"]
 translators:

pl/xml.md

@@ -1,5 +1,4 @@
 ---
-language: XML
 filename: learnxml-pl.xml
 contributors:
   - ["João Farias", "https://github.com/JoaoGFarias"]