Don't require translations to be in title case.

This was already done with settings earlier but now also header and
BDD prefix translations can be specified in any case. Fixes #4411.

atest/testdata/parsing/translations/custom/custom.py

@@ -2,12 +2,12 @@
 
 
 class Custom(Language):
-    setting_headers = {'H 1'}
-    variable_headers = {'H 2'}
-    test_case_headers = {'H 3'}
-    task_headers = {'H 4'}
-    keyword_headers = {'H 5'}
-    comment_headers = {'H 6'}
+    setting_headers = {'H S'}
+    variable_headers = {'H v'}
+    test_case_headers = {'h te'}
+    task_headers = {'H Ta'}
+    keyword_headers = {'H k'}
+    comment_headers = {'h C'}
     library = 'L'
     resource = 'R'
     variables = 'V'

atest/testdata/parsing/translations/custom/resource.resource

@@ -1,9 +1,9 @@
-*** h 1 ***
+*** h s ***
 D                   Example documentation.
 
-*** h 2 ***
+*** H V ***
 ${RESOURCE FILE}    variable in resource file
 
-*** h 5 ***
+*** H k ***
 Keyword In Resource
     No Operation

atest/testdata/parsing/translations/custom/tasks.robot

@@ -1,11 +1,11 @@
-*** H 1 ***
+*** h s ***
 Ta S         Task Setup
 Ta Tea       Task Teardown
 ta tem       Task Template
 TA TI        1 minute
 Ta Ta        task    tags
 
-*** h 4 ***
+*** h ta ***
 Task without settings
     Nothing to see here
 
@@ -18,7 +18,7 @@ Task with settings
     [Ti]     NONE
     Log      Nothing to see here
 
-*** H 5 ***
+*** H K ***
 Task Setup
     No Operation
 

atest/testdata/parsing/translations/custom/tests.robot

@@ -1,4 +1,4 @@
-*** H 1 ***
+*** H S ***
 D                  Suite documentation.
 M                  Metadata    Value
 S S                Suite Setup
@@ -13,10 +13,10 @@ L                  OperatingSystem
 R                  resource.resource
 V                  ../../variables.py
 
-*** H 2 ***
+*** h v ***
 ${VARIABLE}        variable value
 
-*** H 3 ***
+*** H TE ***
 Test without settings
     Nothing to see here
 
@@ -29,7 +29,7 @@ Test with settings
     [ti]           NONE
     Keyword        ${VARIABLE}
 
-*** H 5 ***
+*** h K ***
 Suite Setup
     Directory Should Exist    ${CURDIR}
 
@@ -56,5 +56,5 @@ Keyword
     Should Be Equal    ${arg}    ${VARIABLE}
     [TEA]    No Operation
 
-*** H 6 ***
+*** H C ***
 Ignored comments.

src/robot/conf/languages.py

@@ -32,14 +32,16 @@ def __init__(self, languages):
         self.settings = {}
         self.bdd_prefixes = set()
         for lang in self.languages:
-            self.setting_headers |= lang.setting_headers
-            self.variable_headers |= lang.variable_headers
-            self.test_case_headers |= lang.test_case_headers
-            self.task_headers |= lang.task_headers
-            self.keyword_headers |= lang.keyword_headers
-            self.comment_headers |= lang.comment_headers
-            self.settings.update(lang.settings)
-            self.bdd_prefixes |= lang.bdd_prefixes
+            self.setting_headers |= {h.title() for h in lang.setting_headers}
+            self.variable_headers |= {h.title() for h in lang.variable_headers}
+            self.test_case_headers |= {h.title() for h in lang.test_case_headers}
+            self.task_headers |= {h.title() for h in lang.task_headers}
+            self.keyword_headers |= {h.title() for h in lang.keyword_headers}
+            self.comment_headers |= {h.title() for h in lang.comment_headers}
+            self.settings.update(
+                {name.title(): lang.settings[name] for name in lang.settings if name}
+            )
+            self.bdd_prefixes |= {p.title() for p in lang.bdd_prefixes}
 
     def _get_languages(self, languages):
         languages = self._resolve_languages(languages)
@@ -113,7 +115,7 @@ class Language:
 
     @property
     def settings(self):
-        settings = {
+        return {
             self.library: En.library,
             self.resource: En.resource,
             self.variables: En.variables,
@@ -139,7 +141,6 @@ def settings(self):
             self.timeout: En.timeout,
             self.arguments: En.arguments,
         }
-        return {name.title(): settings[name] for name in settings if name}
 
 
 class En(Language):