#1066 Gradle: HTMLFilter2Test failed on non-English OS

[Hiroshi Miura]

When running gradle test, HTMLFilter2Test#testLoad failed on non-English platform

expected:<[Tag: HTML Attribute:] lang> but was:<[要素： HTML 属性：] lang>
Expected :Tag: HTML Attribute: lang
Actual   :要素： HTML 属性： lang
<Click to see difference>

org.junit.ComparisonFailure: expected:<[Tag: HTML Attribute:] lang> but was:<[要素： HTML 属性：] lang>
    at org.junit.Assert.assertEquals(Assert.java:117)
    at org.junit.Assert.assertEquals(Assert.java:146)
    at org.omegat.filters.TestFilterBase.checkMulti(TestFilterBase.java:465)
    at org.omegat.filters.HTMLFilter2Test.testLoad(HTMLFilter2Test.java:69)

It is because filters2/html2/FilterVisitor class got localized message for the target string.
```
String comment = OStrings.getString("HTMLFILTER_TAG") + " " + tag.getTagName() + " "

                + OStrings.getString("HTMLFILTER_ATTRIBUTE") + " " + key;

```

It is better to configure Gradle to set language to English for running test.

[Aaron Madlon-Kay]

If the test is testing the comment, and the comment is intended to be localized, then the test should account for that.

[Hiroshi Miura]

There is alternative solution that change a test case expectation

        checkMulti("en", null, null, "", "This is first line.",
                OStrings.getString("HTMLFILTER_TAG") +" HTML "

                            + OStrings.getString("HTMLFILTER_ATTRIBUTE") + " lang");

[Hiroshi Miura]

https://github.com/omegat-org/omegat/pull/173

[Hiroshi Miura]

merged [30dfa5]

[Hiroshi Miura]

released 6.0